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RIEIOR FLEX Split-Back Ergonomic Chair FLEX FLEX FLEX FLEX FLEX FLEX FLEX FLEX
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Dynamic Dual-Back System

The FLEX features an independent dual-back design that delivers focused, vertical support, contouring seamlessly to your mid-back and lumbar area.

Adaptive Responsive Support

(a) Engineered to respond to movement, the split-back structure flexes inward under tension to match your natural silhouette. 
(b) Includes 3-stage width adjustment for optimal shoulder and torso stability.

Ergonomic W-Contoured Cushion

(a) Designed around human anatomy, the W-shaped structure stabilizes the pelvis and lower body.
(b) It targets pressure relief around the tailbone, hips, and thighs to support healthier circulation during long hours.

8 cm High-Resilience Molded Foam

(a) High-density foam architecture that contours without sinking. (b) Maintains its structural stability over years of continuous use.

Multi-Directional Precision Adjustability

Fine-tune every angle to match your natural posture for long-lasting, tailored comfort throughout the day.
(a) 2D Headrest: 10 cm height adjustment, 130° outward tilt, and 45° inward tilt.
(b) 4D Armrests: 2.5 cm depth adjustment, 45° swivel, 5 cm lateral slide, and 6 cm height adjustment.
(c) Recline System: Seamlessly transitions from an upright 90° work focus to a 135° tilt for rest.
(d) Retractable Footrest: 4 locking positions designed to relieve leg pressure whenever you need a break.

Engineered for Longevity

The high-density molded foam maintains its balance of softness and solid support, retaining the original shape and elasticity without flattening over time.

Hear From RIEIOR Owners

  • @Joe

    Business Owner
    This chair is a huge upgrade from my old one. It’s my first time trying an independent backrest design, and the ergonomic support feels great for both work and gaming. The footrest is also a nice touch.

  • @Vane
    Office Executive
    I really love the headrest and backrest design. They provide soft and reliable support while working. The casters glide smoothly, letting me move around effortlessly to grab items nearby.
  • @Chrissy

    Programmer

    Love the built-in footrest! The back support is solid and firm. It snugly cradles your shoulders as you lean back, plus it moves freely side to side for extra support.

  • @Meg

    Home Office Mom

    I’m at my desk just as much as any corporate professional, so comfort is a huge deal. The independent backrest is a game changer, it actually moves with me and keeps my back supported all day.

Product Details
Based on chair dimensions, we’ll help you find the perfect fit.
Functions
  • Seat Height Adjustment: 46-56 cm
  • Backrest Support: Self-Adaptive Dynamic Adjustment
  • Backrest Style: Dynamic Dual-Back
  • Backrest Recline: 90°-135°, 4-positions lockable
  • Tension Adjustment: Backrest, Lumbar Support, Backrest Slide
  • Footrest: Optional, 4 locking positions
  • Armrest: 6cm height adjustment, 2.5 cm depth adjustment, 45° swivel, 5 cm lateral slide
  • Headrest: 10cm height adjustment,130° outward tilt, and 45° inward tilt
Basic Attributes
  • Color: Black
  • Max Load Capacity: 149kg
  • Recommended Height: 162-190 cm
  • Average Assembly Time: Approx. 30 minutes
  • Suitable Surfaces: Work quietly and smoothly on most flosurfaces, carpet
Packaging
  • Package Number: 1
  • Weight: 19.1kg
  • Package Dimensions (cm): 53 x 53 x 40
Materials
  • Backrest: Molded Foam
  • Seat: Molded Foam
  • Five-star Base: Nylon
  • Casters: PU
Guarantee and Guidance
  • Warranty: 2 years
  • Certifications:  EN 1335,BIFMA, SGS
FLEX
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ELITE PRO
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Form Factor
Split Back
Integrated S-shaped Backrest
Item Dimensions
68 × 68 × 128 cm
76 × 76 × 128 cm
Item Weight
19.05 kg
19.96 kg
Seat Depth
No
Adjustable Seat Depth 6.35 cm
Armrests
4D Armrests
5D Armrests
Footrest
With Footrest / Without Footrest
With Footrest
Backrest tilt
135° Tilting Backrest
145° Tilting Backrest
Frame Material
Glass Fiber Polyamide
Glass Fiber Polyamide
Seat Material
Molded Memory Foam
Mesh
Recommended Weight Limit
150 kg
150 kg
FAQS
How do I choose the right RIEIOR chair for my height and posture?
Choosing the ideal RIEIOR chair comes down to your personal proportions, body weight, and daily work habits.

To ensure the ultimate ergonomic fit, we recommend comparing your current desk setup and measurements against the detailed sizing guides on our product pages.

Still not sure which model suits you best? Our specialists are always on hand to help. Drop us a message at rieior@official.com for personalized guidance on finding your perfect desk companion.
What is RIEIOR shipping policy?
All RIEIOR® products purchased directly from our official website include Free Standard Shipping.

We currently offer free standard shipping to the following regions:

North America: The 48 contiguous United States.

Europe: Germany, Poland, Netherlands, Slovenia, Belgium, Italy, Austria, Denmark, France, Hungary, Slovakia, Luxembourg, Spain, Czech Republic, Lithuania, Estonia, Sweden, and Romania.

Located elsewhere? Please contact us before placing your order so we can calculate shipping costs and assist you with the process.
Do you offer free shipping in the UK?
Yes! We offer Free Standard Delivery on all orders across mainland UK (England, Wales, and the Scottish Lowlands).
What is covered by the RIEIOR warranty?
Every product purchased directly from the RIEIOR® official website comes with a 2-year limited warranty.

To ensure your chair remains safe and comfortable, please follow our official assembly and maintenance instructions strictly. For a full breakdown of what is covered, please visit our warranty Page.
How can I track my order?
Once your order leaves our warehouse, we will send you a shipment confirmation email containing a tracking link.

You can also check the delivery status at any time by visiting the "Track My Order" section on our website and entering your email address, customer ID, or order number.

Please note: It may take up to 24 hours for tracking information to update after your package has been collected by the carrier.