Flex, Ergonomic Office Chair

Regular price $279.99
Sale price $279.99 Regular price $399.99
Save $120 (30%)
Color: Off-White
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Meet the Flex, an ergonomic office chair in a league of its own. Its unparalleled lumbar support stems from an innovative dual backrest design, ensuring an unprecedented level of comfort and support.


  • Adaptive Double Back Design: Ideal for those in long-term sedentary office roles and gamers, the clearance spine disperses pressure, and the seat back can be tilted left and right to different positions.
  • Adjustable Backrest: The double-leaf back frame can be adjusted up and down to fit the curve of the spine, fully support the back, and make sitting more comfortable.
  • Synchronous Reclining Seat Back: Adjust the backrest to three positions—90°, 110°, and 135°—using the toggle lever. Shift your body weight to achieve the desired seat inclination, allowing you to find your most comfortable sitting position.
  • Double-Back Technology: Optimal protection comes from alignment with the physiological curve of the human body. Regardless of your posture adjustments, the back support consistently guides you back to the correct alignment.
  • Contact Us: Please feel free to contact us with any questions. Our local customer support team is always there to offer timely help.


  • SKU: ERK-OC10
  • Style/Type: Ergonomic Office Chair
  • Color: Off-White/Dark Gray
  • General Dimensions: 27.56" D x 24.80" W x 44.09-49.60" H
  • Item Weight: 35.93 lbs.
  • Seat Height: 16.92-20.86"
  • Seat Depth: 16.92"
  • Seat Width: 19.69"
  • Max Weight Capacity: 275 lbs.
  • Armrest Type: 3D Armrest
  • Hydraulics Gas Piston: Class 4
  • Material: Fabric
  • Box Dimensions: 26.77" L x 18.90" W x 20.87" H
  • Box Weight: 41.45 lbs.
  • Recommended height:5‘1‘’-6’1‘’

Installation Manual

Buying Guide

  • About Color Difference

Please note that regarding color accuracy, we strive to display our products on our website as faithfully as possible, considering the variations in individual color perception due to lighting and screen differences.


  • Free Shipping (Lower 48 US States Only)
    We work with multiple third-party delivery partners for delivery and do not currently offer expedited or 2-day shipping. We have two default delivery services, limited to the lower 48 US states only. large item(s) is typically delivered via LTL freight shipping, and general item(s) is delivered via FedEx/UPS. It cannot be delivered to rural routes, Hawaii, Alaska, APO/FPO addresses, or P.O. boxes. Customers in such areas will be charged additional shipping fees. Please consult customer service for shipping quotes.
  • FedEx/UPS will dropped off the item(s) in front of the first ground-level entryway outside your home (front door, porch, or garage). Transit time for free standard shipping varies from 2-7 business days and is not guaranteed.
  • Free LTL freight delivery is Curbside Drop-Off, transit time for free standard shipping varies from 7-18 business days and is not guaranteed. Deliveries are not typically made at weekends or on holidays. The carrier will unload the item(s) to the ground for you at the loading area or in front of the building/house at the curb. This service does not include unpacking, assembly, or garbage removal. Due to the large volume and weight of the product, you may need some assistance from a family member or friend for the removal of the item(s) from the curbside to your house.
  • Paid upgrade services: We can provide upgrade services, including white gloves or other delivery services, if upgrading services it may cause extra charges. And for more detail please contact our customer service.
  • Once your order has been processed, we will email you order status updates and your tracking number. You can always access your account online and view your order status and tracking details there.


Return & Refund Policy (U.S. Only)

  • If you are not satisfied with the product, You have 30 days after delivery to return the product in its original condition. Return shipping costs are the responsibility of the customer. Upon return, your merchandise will be inspected and appropriate credits and/or refunds will be issued for the item(s) and any taxes due to be refunded in accordance with state law. A restocking fee will apply.

  • But if you have any concerns and wish to return the product, please reach out to our Customer Care Experts. We offer solutions to help you fix what’s wrong, so you can keep and love the things you buy. Because sometimes no return is the easiest return of all.
  • If the products are damaged/defective upon arrival, please call customer service or contact us via email within 72 hours.
  • Services: Services like assembly and installation, expedited shipping (i.e. next day or 2nd-day shipping), and extended warranty are non-refundable.
  • Note: We only accept returns if they are purchased directly from us on eurekaergonomic.com and flagship stores established in online marketplaces that are registered under the name of an Eureka Ergonomic entity. Please contact the relevant distributor if otherwise.
  • For other details about exceptions to our return policy, please check THIS LINK.
Free shipping On All Orders
30 Day Return Policy Easy Returns and Refunds
Warranty Safe and Secure
Flex Ergonomic Home Office Chair,Adaptive Double Back Design,Off-White
Regular price $279.99
Sale price $279.99 Regular price $399.99

Are You Experiencing Lower Back Pain?

Double-back chairs are designed to alleviate discomfort. An ergonomic chair relieves back pain, eases the discomfort of prolonged sitting, and maintains a productive working posture.

German Innovation. Dual-Back Technology.

Conceived by German physicist Dr. Brunig, the dual-back ergonomic concept is regarded as a historic "chair revolution." Biomorphic dual-back design ensures a consistent healthy posture, alleviating discomfort and pain.

+1 Backrest, +N Comfort

The backrest moves with you! It’s like having two hands supporting your back at all times, guiding you to assume a correct posture.

Ergonomic Design, Care For The Spine

The chair body incorporates an ergonomic design, ensuring a more tailored fit to the human spine and alleviating pressure on the lower back.

Saddle-Shaped Seat Cushion

Prevents thigh compression and numbness during extended sitting periods by utilizing a saddle-shaped ergonomic design.
Conforms to various body types, providing a snug fit for the hips and legs, reducing leg pressure, and ensuring long-lasting comfort.

Backrest and Seat Cushion Thickened With High-Elastic Sponge Filling

Enjoy a comfortable and soft sensation.

Highly Elastic Woven Mesh Fabric. Aesthetics Meet Comfort.

Made from high-elastic woven fabric, this material provides a velvety touch akin to the feel of skin. Through a distinctive weaving technique, it achieves a harmonious blend of elasticity, softness, and durability.

Adjustable Backrest Height

Four adjustable height positions with a 1.57" range, each level offering a 0.39" adjustment, catering to individuals of different heights and body types.

Adjustable Headrest

The headrest is height-adjustable with a 0.39" range, and its angle can be adjusted up to 35°. It aids in maintaining the correct posture and reducing neck fatigue.

3D Armrests - Multi-directional Adjustment

3D multi-angle adjustment accommodates different heights, providing comfortable arm support.

90-135° Rocking Recline

With three locking positions at 90°, 110°, and 135°, the double backrest design ensures that pressure is evenly distributed on the back, protecting the spine from stress and enhancing your comfort while reclining.

Exceptional Quality

Made of High-Quality Materials


Customer Reviews

Based on 20 reviews

Excellent and comfortable

Kathleen Ennes

I have been working from home for 4 years. This is the third chair I have purchased and feel very comfortable in saying this will be the last one I will need.
I LOVE everything thing about it.

Greatest office chair!

Comfortable, supportive, with so many adjustment options for different work circumstances. And the full lie back option is perfect for mini breaks, or listening to audio. I love it and it works beautifully with my Eureka desk.

Roger F
The Flex

Most comfortable chair ever. It really helps with posture and now my back pain is gone. I’m really happy with this purchase.

Donna Stading-Smith
Totally Satisfied Highly Recommend

This chair offers Lumbar support at exact location needed. Customer Support is Outstanding!! Highly Recommend this Chair & Store. Donna S-S