S3 Flex Split Back Ergonomic Chair

Name: S3 Flex Split Back Ergonomic Chair
Brand: RIEIOR
SKU: RIS3FLEXRF
Price: 169.99 EUR
Availability: InStock
Rating: 4.9 (84 reviews)

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€169,99 EUR €329,99 EUR Save €160,00 EUR

Style

With Retractable Footrest Without Footrest

Quantity

Fast FREE Shipping

Two-year Warranty

2026 Edition | Introductory Offer

Built with a unique split dual-back design, this S3 Flex ergonomic chair offers dynamic, personalized support that adapts to your movement.
It supports your natural spinal curve while improving posture and reducing pressure on the lower back. Customize seat height, armrests, headrest and recline to match your body.

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Pre-order | S3 Flex Dual Backrest Office Chair

Designed for Dynamic Pressure Distribution

Kinematic Dual-Back Architecture

Engineered with an advanced dual-backrest system, the S3 Flex delivers targeted vertical stabilization to precision-target the lumbar region.

Reactive Bi-Axial Contouring

With an autonomous split-back mechanism, the system pivots inward responsively under kinetic pressure to deliver a tailored, contoured embrace.
Integrated with a refined 3-stage width calibration, the architecture self-adjusts to the specific morphology of the thoracic and shoulder regions, ensuring optimal localized stabilization.

Anatomical W-Contoured Geometry

A form-fitting W-matrix that stabilizes the lower musculoskeletal structure through balanced load distribution. It eliminates concentrated ischial pressure, ensuring optimal circulation and uninterrupted ergonomic endurance.

80 mm High-Density Molded Foam

A precision-engineered, single-piece foam matrix that synchronizes load support with contouring compression. Featuring advanced density retention, the architecture prevents indentation and material fatigue for uninterrupted structural integrity.

Full-Body Adjustment Suite

Comprehensive controls include a 2D headrest, 4D armrests, and variable recline tension. The system supports natural movement throughout the day, providing an easy transition from high-focus desk tasks to deep relaxation.

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

@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.
@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.

Product Details

Based on chair dimensions, we’ll help you find the perfect fit.

Dimensions

Product Dimensions: 26"D x 27"W x 49.61"H
Item Weight: 42 Pounds
Unit Count: 1.0 Count
Material: Glass Fiber Polyamide, Molded Foam
Frame Material: Glass Fiber Polyamide
Seat Material Type: Molded Memory Foam
Maximum Weight Recommendation: 330 Pounds

Specification

Item Weight: 42 Pounds
Seat Height: 22 Inches
Seat Depth: 20 inches
Seat Length: 21 Inches
Seat Back Interior Height: 30 Inches
Arm Height: 10 Inches

	S3 Flex View More	S3 Elite Pro View More
Form Factor	Split Back	Integrated S-shaped Backrest
Item Dimensions	26"D x 27"W x 49.61"H	30"D x 30"W x 47.6"H
Item Weight	42 pounds	44 pounds
Seat Depth	No	Adjustable Seat Depth 2.5''
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	330 Pounds	450 Pounds

FAQS

How do I know if a RIEIOR chair is the right fit for me?

Finding the right RIEIOR chair depends on your height, weight, and usage. We suggest comparing our listed specifications against your current setup for a guaranteed fit.
If you need expert advice, reach out to official.rieior@gmail.com and our team will guide you.

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.

What does RIEIOR warranty cover?

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 is on its way, you will receive a confirmation email containing your tracking number. You can also track your status at any time by logging into your account on our website.

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