Tan Leather Office Chair
2 resultsThis La-Z-Boy Aberdeen computer and desk chair comes standard with the ComfortCore zoned technology for optimal lasting comfort. An advanced layering system is designed to offer deliberate, unique, and zone-based support. The chair has an extra-padded back design that will fit into any office area..Executive, Modular Office Space .Tan Bonded Leather.Ergonomic Lumbar and Head Support .Overall dimensions: 45.5"-48.5"H x 28.75"W x 31.5"D. Computer and desk office chair with a swivel seat for maximum workspace use.Padded adjustable arms for supporting your forearms.Swivel-tilt mechanism with adjustable tension control for comfort.This chair can safely support a user who weighs up to 275 lbs. for a full work day.Assembly required.Central pivot seat plate for height and tilt adjustments.Unique extra-padded back design.Oversized casters.10-year manufacturer limited warranty.This product is listed on the BIFMA Compliant registry as a product that conforms to rigorous safety and durability testing standards.LA-Z-BOY is a trademark of LA-Z-BOY Incorporated and is used under license to Living Style (Singapore) Pte. Limited. Version.WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.Exclusively from Staples
The better you sit, the better you will feel after you complete your work, play or the many other activities our chair assortments are used for. Like with our mattresses, that's a big responsibility for us, and we take it seriously, with more than 15 years of making chairs and innovating with designs, technology & materials. A modern style designed with ample space and ultra-comfortable cushions, the Serta Torrington Big & Tall Office Chair is the perfect office chair to sink into comfort and stay focused from 9 to 5 and beyond. Find customized comfort with the easy-to-reach height and recline adjustment lever and tension knob, and padded armrests that flip up and out of the way for space-saving convenience. Made with superior quality materials, this design comes with a durable 5-point base with smooth-rolling casters so you can safely glide across most carpet types. Treat yourself with the exceptional comfort and style of the Serta Torrington Big & Tall Office Chair..Big & Tall, Modular Office Space.Tan EPU.Ergonomic Lumbar Support.Overall Dimensions: 30.25"D x 28.75"W x 45.75"- 49.5"H.High-back, spacious office chair.Comfortable and stylish leather-like upholstery.Pillow-soft headrest and back bolster cushions.Seat cushion with high quality foam and ComfortCoils.Easy-touch height adjustment lever.Tilt tension adjustment knob and recline lockout.Flip-up, plush padded armrests.Superior quality nylon base with black finish.360° dual-wheel swivel casters that glide across most carpet types.Casters are intended for use on carpet and are not recommended for use on tile or hardwood floors.Easy to assemble with all required tools included.
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Stay productive yet relaxed with the La-Z-Boy Arcadian bonded leather executive chair. The Arcadian is beautifully designed with smooth bonded leather upholstery and supportive multilayered ComfortCore seat construction to target body discomfort and promote circulation for hours of comfort..Embrace sophisticated style and luxurious comfort with this swivel executive chair.Upholstered in soft bonded leather with plush armrests for premium comfort.ComfortCore multi-layer seat technology for targeted support and lasting comfort.Fully adjustable height, recline, and tilt settings make it easy to find a posture and position for customizable comfort.360° wheels glide across most carpet types so you can change places with ease.Durable 5-star nylon base and 360° dual-wheel swivel casters.Overall dimensions: 43.25"-46.25"H x 28"W x 29.5"D.Safely supports up to 275 lbs..This product is listed on the BIFMA Compliant registry as a product that conforms to rigorous safety and durability testing standards.Endorsed by the American Chiropractic Association.Assembly required.10-year manufacturer limited warranty.GREENGUARD certified to help reduce indoor air pollution and the risk of chemical exposure.LA-Z-BOY is a trademark of LA-Z-BOY Incorporated and is used under license to Living Style (Singapore) Pte. Limited..Casters are intended for use on carpet and are not recommended for use on tile or hardwood floors.Exclusively from Staples
The La-Z-Boy Trafford Big & Tall Executive Office Chair gives you room to move, stretch, lean, and recline—in comfort and style. Ergonomically designed with layered memory foam cushions, this comfortable office chair delivers great support and comfort while you work. The AIR Technology built into the lumbar support pivots when you move to cradle your back at every angle. With soft, padded armrests, adjustable height, and recline and tilt lock, this executive office chair from La-Z-Boy is a whole package!.Flexible AIR Lumbar Technology pivots and conforms the lumbar area in response to movement to improve posture and provide better back support than standard chairs.Big & Tall design with generous seating area supports up to 350 lbs..ComfortCore Plus with Memory Foam advanced layering system provides varying support for optimal comfort, stability and durability.Overall dimensions: 44.5"-48.5"H x 28"W x 32"D.Seat dimensions: 21"-23"H x 21.75"W x 19"D.Hand-sculpted fixed arms with padding.Swivel tilt for comfort.Rated weight capacity: up to 350 lbs..Full assembly required.Big and tall design with generous seating area accommodates larger bodies.Wellness by Design flexible AIR lumbar technology pivots and conforms the lumbar area in response to movement to improve posture and provide better back support than standard chairs.ComfortCore Plus advanced layering system with memory foam provides individualized support for optimal comfort, stability, and durability.Poly fiber top layer adds to overall plushness and gives flexible comfort.Firmer support layer at the back of the seat cushion for stronger support.Top-layer seat cushioning helps alleviate discomfort.Pneumatic lift with adjustable tension and lock-out feature ensures correct foot positioning.Extra-large steel seat plate and thicker plywood construction for long-lasting durability.Heavy-duty 2.36" casters offer smooth mobility.1-year manufacturer limited warranty.Meets or exceeds ANSI/BIFMA standards.Designed to accommodate up to 400 lbs, this ergonomic Big & Tall office chair features a zone-based cushioning system and advanced lumbar technology that reacts to your movement to keep you comfortable, supported and relaxed while you work.
La-Z-Boy's premier office seating comes standard with Comfort Core zoned technology for optimal firmness and lasting comfort. An advanced foam layering system is designed to offer deliberate, unique, and zone-based support..Executive office chair with a swivel seat for maximum workspace use.Upholstered in soft gray bonded leather.This chair provides headrest, has ergonomic seat-side adjustment paddles, and layered body pillow for lasting comfort.Overall dimensions: 43.25-46.25"H x 28.25"W x 29.5"D.Seat dimensions: 18.75-21.75"H x 22.25"W x 19"D.Upholstered arm pads for supporting your forearms.Swivel-tilt with adjustable tension control for comfort.Weight is rated up to 275 lbs..Assembly required.Meets or exceeds ANSI/BIFMA standards.Comes with Comfort Core technology for optimal firmness and lasting comfort.Features durable five-star nylon base and dual-wheel mobility casters.10-year manufacturer limited warranty.LA-Z-BOY is a trademark of LA-Z-BOY Incorporated and is used under license to Living Style (Singapore) Pte. Limited..Exclusively from Staples
The Serta Works executive chair can do laps around any ordinary office chair. Made with gamers and programmers in mind, this feature-rich chair can help improve your posture. The ergonomic seat and lumbar are contoured to provide customized support and reduce stress in back, neck, and shoulders. The pneumatic seat height adjuster works with a simple weight shift, making it easy to find the right fit for you. And with its sleek race car inspired design, you'll feel like you're sliding into the driver's seat of a high-performance race car. Made with faux leather upholstery and breathable mesh accents, this chair will keep you cool, so you can warm up for your next presentation or round of Gran Turismo..High-performance executive chair made in the style of a race car driver's seat is designed for optimized productivity.Light gray faux leather with breathable mesh accents helps you keep your cool.Ergonomic contoured lumbar support relieves stress in the back and neck, keeping you at the top of your game.Overall dimensions: 46"H x 25.8"W x 28"D.Seat height: 18.75"-22.5".Padded fixed arms for supporting your forearms.Locking tilt with adjustable tension control for comfort.Partial assembly required.1-year manufacturer limited warranty.Meets or exceeds ANSI/BIFMA standards
The Lockland Big & Tall bonded leather managers chair offers top quality comfort, multiple adjustment features and supports up to 400 lbs..Big & Tall managers chair.Black bonded leather back and seat.Overall Dimensions: 45.7" - 49.6" H x 29.3" W x 31.2" D.Seat Dimensions: 21.26"- 22.4" W x 18.74" D.Back Dimensions: 31.0" H x 23.2" W.Seat height adjustment, tilt tension and tilt lock.Suitable for up to 10 hours of use per day.Supports up to 400 lbs..Seat Height: 19.8" - 23.7" H.Distance between arms: 22.0" W.Certifications and standards: Meets ANSI or BIFMA standards.5-year manufacturer limited warranty.a href="https://marketingassets.staples.com/m/6a98f55d3a957259/original/Instructions-ST63098.pdf/"target=”_blank”Product Instructions/a.WARNING: This product can expose you to chemicals including Di(2-ethylhexyl)phthalate (DEHP), which is known to the State of California to cause cancer and reproductive harm. For more information, go to: www.P65Warnings.ca.gov.Lockland Bonded Leather Big & Tall Managers Chair, Black
This La-Z-Boy Harnett executive office chair is designed for comfort by offering superior ergonomic features, with unique style. The chair uses ComfortCore, an advanced foam layering system that offers zone-based support through strategic cushion mapping. This executive office chair features soft support at the front of the cushion, firmer support at the back of the cushion, and poly fiber fill comfort top layer for supreme comfort..Luxurious and stylish, this executive chair can be used anywhere.Pillowed body layers upholstered in black faux leather with solid wood arms and base.Ergonomic controls allow you to adjust the height and tilt for improved body alignments while lock functions keep your settings in place.Overall dimensions: 43.2-45.25"H x 27"W x 33"D.Fixed arms for supporting your forearms.Locking tilt with adjustable tension control for comfort.Rated weight capacity: up to 350 lbs..Full assembly required.Cable-actuated tilt, lock, and height adjustment.Dual-wheel multi-surface casters.1-year manufacturer limited warranty.seat dims: 19" Dx 22"Hx 19" D.Back Dims: 22.25" W.Meets or exceeds ANSI/BIFMA standards
This La-Z-Boy Harnett executive office chair is designed for comfort by offering superior ergonomic features, with unique style. The chair uses ComfortCore, an advanced foam layering system that offers zone-based support through strategic cushion mapping. This executive office chair features soft support at the front of the cushion, firmer support at the back of the cushion, and poly fiber fill comfort top layer for supreme comfort..Luxurious and stylish, this executive chair can be used anywhere.Pillowed body layers upholstered in coffee color faux leather with solid wood arms and base.Ergonomic controls allow you to adjust the height and tilt for improved body alignments while lock functions keep your settings in place.Overall dimensions: 43.2-45.25"H x 27"W x 33"D.Fixed arms for supporting your forearms.Locking tilt with adjustable tension control for comfort.Rated weight capacity: up to 350 lbs..Full assembly required.Cable-actuated tilt, lock, and height adjustment.Dual-wheel multi-surface casters.1-year manufacturer limited warranty.seat dims: 19" Dx 22"Hx 19" D.Back Dims: 22.25" W.Meets or exceeds ANSI/BIFMA standards
Combining advanced comfort technology with a timeless style, the La-Z-Boy Cantania executive office chair is a smart choice for any office, home, or entertainment space. This chair features flexible AIR lumbar technology that pivots and conforms to the lumbar area according to your movement, helping improve posture and reduce discomfort. It is also designed with Comfort Core Plus memory foam cushions, which is an advanced layering system that offers zone-based support with cushioning in the areas you need it most. The strategically placed plush body pillows and padded headrest combine to provide neck support and minimize pressure points, helping you feel more rested after long days at work. The ergonomic chair is fully adjustable for optimized body alignment. Crafted with silver color painted components, this high-back office chair with hand-sculpted arms is upholstered in a soft bonded leather to deliver comfortable, contemporary style to any work space..Combining advanced comfort technology with a timeless style, this executive office chair is a smart choice for any office, home, or entertainment space.Upholstered in black bonded leather.Ergonomic seat-side controls allow for quick and easy height and tilt adjustment; contoured lumbar zone provides customized lower back support.Overall dimensions: 44.25"-46.25"H x 26.5"W x 32"D.Seat dimensions: 20.5"-22.5"H x 19.75"W x 19.25"D.Back dimensions: 29.75"H x 19.75"W.Hand-sculpted upholstered arms for convenient use.Supports up to 250 lbs..Assembly required.Memory foam layer conforms to deliver individualized support.Poly fiber top layer adds to the overall plushness.Softer support layer at the front of the seat cushion for flexible comfort.Plush pillowed body layers provide cushioning and pressure point relief.Elevated and padded headrest offers comfort and improves neck support.Pneumatic lift with adjustable tension and lockout feature ensures correct foot positioning.Fortified base layer extends stability and durability.Heavy-duty 2.36" casters offer smooth mobility.1-year manufacturer limited warranty.Meets or exceeds ANSI/BIFMA standards
Find a reason to relax during your workday with this Executive Office Chair from Serta, a brand known for quality and comfort. This ergonomic desk chair has layered body pillows and a pillowed headrest to provide ease while seated for long periods of time. The hand-sculpted arms and smooth bonded leather upholstery have a sleek, professional look that stands out in any work environment. Fully adjustable, this executive office chair allows the user to customize the height and lumbar zone for optimal comfort. This desk chair has a five-layer cushioning system for all day comfort and support.Premium Ultra Smart Layers foam and individual pocketed ComfortCoils provide ultimate comfort.Contoured lumbar zone provides premium lower back support to alleviate discomfort.Product Dims: 40.75"H x 26.75"W x 30"D.Seat: 20.25"W x 19"D.Elevated and padded headrest offers comfort and improves neck support.Contoured lumbar zone provides customized lower back support to alleviate discomfort.Pneumatic height lift with adjustable tilt, tension knob and lock out feature ensures customized positioning.Reinforced back, extra-large steel seat-plate bar and fortified base for added durability.Heavy-duty base with smooth rolling casters offer smooth mobility.Some assembly required.Supports up to 250 lbs..1 year limited warranty.Meets or exceeds ANSI/BIFMA standards
The Serta Works executive chair can do laps around any ordinary office chair. Made with gamers and programmers in mind, this feature-rich chair can help improve your posture. The ergonomic seat and lumbar are contoured to provide customized support and reduce stress in back, neck, and shoulders. The pneumatic seat height adjuster works with a simple weight shift, making it easy to find the right fit for you. And with its sleek race car inspired design, you'll feel like you're sliding into the driver's seat of a high-performance race car. Made with faux leather upholstery and breathable mesh accents, this chair will keep you cool, so you can warm up for your next presentation or round of Gran Turismo..High-performance executive chair made in the style of a race car driver's seat is designed for optimized productivity.Black faux leather with breathable gray mesh accents helps you keep your cool.Ergonomic contoured lumbar support relieves stress in the back and neck, keeping you at the top of your game.Overall dimensions: 35.75"-38.75"H x 24"W x 27.25"D.Seat height: 18.75"-22.5".Padded fixed arms for supporting your forearms.Locking tilt with adjustable tension control for comfort.Partial assembly required.1-year manufacturer limited warranty.Meets or exceeds ANSI/BIFMA standards
The La-Z-Boy Vannes executive chair is designed for top-down ergonomic comfort while you work. Its advanced, multilayered ComfortCore Plus seat construction with memory foam combined with the knee-tilt recline function provides targeted, personalized comfort and support..This executive chair is designed for top-down ergonomic comfort while you work.Made with polyurethane upholstery in gray.Padded headrest and contoured lumbar to support perfect ergonomic posture.Overall dimensions: 46.5"-49.5"H x 28.5"W x 29.75"D.Seat dimensions: 20.5"-23.5"H x 20.75"W x 19.25"D.Sturdy armrests with padding for supporting your forearms.Weight capacity: 275 lbs..Meets or exceeds the FSC, GREENGUARD, and BIFMA standards.Quality construction with durable metal base.Multilayered ComfortCore Plus memory foam seat construction, with soft comfort layers in the front and firmer support layers towards the back.Knee-tilt recline, tilt lock, and tension adjustments for comforting relief.Premium PureSoft upholstery for smooth, top-down comfort.Adjustment lever for pneumatic height personalization.360-degree dual-wheel swivel casters that glide with ease over most carpet types.Casters are intended for use on carpets and are not recommended for use on tile or hardwood floors.Endorsed by the American Chiropractic Association.10-year manufacturer limited warranty.LA-Z-BOY is a trademark of LA-Z-BOY Incorporated and is used under license to Living Style (Singapore) Pte. Limited..WARNING: This product can expose you to chemicals including Di (2-ethylhexyl) phthalate (DEHP), which is known to the state of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.Exclusively from Staples
The La-Z-Boy Big & Tall Edmonton executive office chair is a spacious and sturdy ergonomic office chair constructed with a thick plywood core, reinforced back bar, and heavy-duty casters for reliable and long-lasting durability. The ComfortCore Plus advanced layering system with memory foam cushions offers targeted support: strategically placed plush body pillows and padded headrest combine to provide neck support and minimize pressure points, helping you feel more rested after long days at work. This chair is fully adjustable for a personalized fit, including height, tilt, and recline for optimized body alignment..Spacious and sturdy ergonomic executive office chair great for working, gaming, or just relaxing in comfort.Black bonded leather upholstery is complemented by classic solid wood arms and base.Ergonomic control levers let you customize your sit position and provide height and tilt adjustments for improved body alignment.Overall dimensions: 45.5"-48.5"H x 28.5"W x 32.75"D.Seat dimensions: 21"-24"H x 21.75"W x 20.25"D.Back height: 29.75".Fixed armrests with soft upholstered pads for all-day comfort.Accommodates up to 350 lbs..Easy to clean with warm water and mild soap.Partial assembly required.Constructed with a thick plywood core, reinforced back bar, and heavy-duty casters for reliable and long-lasting durability.Comfortable memory foam topped seat core provides an optimal mix of firmness and cushioning.Thick back cushions give your back contoured lumbar support.1-year manufacturer limited warranty.Meets or exceeds ANSI/BIFMA standards
The better you sit, the better you'll feel. Whether for work, play, or any other activity that has you sitting in our chairs, we believe comfort is everything. We know it's a big responsibility and take it seriously, just as we do with our mattresses. With over 15 years of making chairs and innovating with designs, materials, and technology, Serta knows what it takes to give you a comfortable sit. The Serta Comfort series of office chairs offers a luxuriously cushioned seat, backrest, and armrests filled with thick, non-recycled Serta foam and upholstered in a soft breathable bonded leather to keep you cool and comfortable during extended use. This chair seamlessly blends its comfort with sleek design, accented by a single channel tuft. Choose from Black, Brown, Gray, or Cognac to find the perfect match for your workspace. This executive big & tall model is a high-back design which can be helpful for people who tend to experience discomfort due to long sitting periods. High-back chairs offer upper back, shoulder, and neck support and encourages proper spinal alignment by supporting the back in a neutral position which helps reduce muscle fatigue and promotes a better overall posture. The 360° swivel metal base on double-wheel casters glides smoothly across carpets or rugs, and can handle up to 350 lbs. Finding your ideal seated position is easy with the one-touch side lever for convenient height adjustment to match your work style and desk set-up. Whether you're conquering emails or squeezing in work between kid duty and dog walks, the Serta Comfort Executive Big & Tall office chair will transform your home office into a command center of productivity..Big & Tall, Modular Office Space .Gray Bonded Leather .Ergonomic Lumbar Support.Overall Dimensions: 30.25" D x 27.75" W x 46"- 49" H. Smooth bonded leather upholstery.Pillow-soft head, neck, and back support cushions.Comfortable foam seat cushion.Easy-to-use height adjustment and recline lockout control lever.Tilt tension adjustment knob to personalize the recline.Ergonomic padded armrests.Durable nylon base with black finish.360° dual-wheel swivel casters that glide across most carpet types.Constructed with quality materials to safely support up to 350 lb..Easy to assemble with all required tools included.This product exceeds BIFMA industry standards for safety, quality, and durability.Endorsed by the American Chiropractic Association.WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Stay productive yet relaxed with the La-Z-Boy Arcadian bonded leather executive chair. The Arcadian is beautifully designed with smooth bonded leather upholstery and supportive multilayered ComfortCore seat construction to target body discomfort and promote circulation for hours of comfort..Embrace sophisticated style and luxurious comfort with this swivel executive chair.Upholstered in soft bonded leather with plush armrests for premium comfort.ComfortCore multi-layer seat technology for targeted support and lasting comfort.Fully adjustable height, recline, and tilt settings make it easy to find a posture and position for customizable comfort.360° wheels glide across most carpet types so you can change places with ease.Durable 5-star nylon base and 360° dual-wheel swivel casters.Overall dimensions: 43.25"-46.25"H x 28"W x 29.5"D.Safely supports up to 275 lbs..This product is listed on the BIFMA Compliant registry as a product that conforms to rigorous safety and durability testing standards.Endorsed by the American Chiropractic Association.Assembly required.10-year manufacturer limited warranty.GREENGUARD certified to help reduce indoor air pollution and the risk of chemical exposure.LA-Z-BOY is a trademark of LA-Z-BOY Incorporated and is used under license to Living Style (Singapore) Pte. Limited..Casters are intended for use on carpet and are not recommended for use on tile or hardwood floors.Exclusively from Staples
The better you sit, the better you'll feel. Whether for work, play, or any other activity that has you sitting in our chairs, we believe comfort is everything. We know it's a big responsibility and take it seriously, just as we do with our mattresses. With over 15 years of making chairs and innovating with designs, materials, and technology, Serta knows what it takes to give you a comfortable sit. Unwind, recharge, and conquer your workday with the Serta Comfort Modern Executive Office Chair. Featuring plush mid-back support, clean lines, luxurious channel-tufting and sculpted arms, this chair will elevate any space. A semi-plush, double-layer cushion seat with generously padded back and armrests provides ample lumbar support and will help you maintain a positive ergonomic posture while surrounding you in comfort. Thick non-recycled Serta quality foam is upholstered in a soft to touch breathable bonded leather to keep you cool during extended sitting times. Available in Black, Brown, Gray, or Cognac with matte black components. A 360º swivel metal base gives you mobility throughout the day and handles weight up to 275 lbs. Plus, the double-wheel casters ensure smooth gliding over rugs and carpet floors so you can scoot around your workspace with ease. Finding your ideal seated position is a breeze with the convenient seat-side lever. Simply adjust the height to perfectly match your stature and desk setup for a personalized fit. A perfect workday companion that adapts to your needs, the Serta Comfort Modern is made for productivity and well-being whether you're tackling the day from a corner office or at home in the bedroom..Executive, Modular Office Space .Gray Bonded Leather .Ergonomic Lumbar Support.Overall Dimensions: 30.5" D x 27.75" W x 40"- 44" H.Double-layer foam seat cushion.Control lever for pneumatic height adjustment.Adjustable recline tension knob to personalize your recline comfort.Ergonomic padded armrests.Strong but lightweight metal base with black finish.360° dual-wheel swivel casters that glide across most carpet types.Constructed with quality materials to safely support up to 275 lb..Easy to assemble with all required tools included .This product meets BIFMA industry standards for safety, quality, and durability.Endorsed by the American Chiropractic Association.WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Featuring plush cushioning, clean lines, and a tailored silhouette, the Thomasville Furniture Upton bonded leather office chair is an inviting blend of comfort and style. With handsome bonded leather upholstery on the seating surface and a sturdy metal base, this home office chair is well-suited to a range of decors. Ergonomic and adjustable, this modern desk chair is fitted with a pneumatic lift mechanism to control the height, tilt, and lift for optimized body alignment. The dual-layer design provides a soft top pillow layer formed over a durable, reinforced structural back layer for lasting comfort and support. Finished with sturdy rolling wheels, this executive office chair allows you to move quickly and efficiently around your office space..Featuring plush cushioning, clean lines, and a tailored silhouette, this manager chair is an inviting blend of comfort and style.Bonded leather upholstery on the seating surface is soft and comfortable; comes in gray.Mid-back height gives this office chair a sleek profile while providing back support.Overall dimensions: 40.5"-44.25"H x 24.25"W x 29.75"D.Seat dimensions: 19.5"-23"H x 21.5"W x 20"D.Back dimensions: 26.25"H x 21.25"W.Fixed padded arms to support the shoulders and upper body.Supports up to 275 lbs..Assembly required.Pillowy dual-layer cushions provide plush comfort and hold up over time.Adjustable pneumatic lift mechanism with lockout feature allows you to adjust this computer chair for ergonomic positioning.Durable metal base with rolling wheels to provide heavy-duty support as you move around the office with ease.1-year manufacturer limited warranty.Meets or exceeds ANSI/BIFMA standards