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  • S3 Flex Dual Backrest Office Chair
  • RIEIOR Flex Ergonomic Chair
  • Pre-order | S3 Flex Dual Backrest Office Chair
  • Pre-order | RIEIOR S3 Flex Dual Backrest Office Chair
  • Pre-order | S3 Flex Dual Backrest Office Chair
  • S3 Flex Dual Backrest Office Chair
  • S3 Flex Dual Backrest Office Chair
  • S3 Flex Dual Backrest Office Chair
  • S3 Flex Dual Backrest Office Chair
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S3 Flex Dual Backrest Ergonomic Chair

$229.99 USD
El envío se calcula al finalizar la compra.
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Two-year Warranty
24/7 Dedicated Customer Support
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Built with a unique split dual-back design, this S3 Flex ergonomic task 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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Separated Dual-Zone Support for a Unique Sitting Experience

RIEIOR Dual-Back Support

The S3 Flex's upgraded dual-backrest system provides targeted vertical support to instantly relieve lower back pressure. 

Dynamic Wrap-Around Support

Our split-back automatically pivots inward under pressure for a "wrapped". Combined with 3-level width adjustment, it provides a custom, snug fit for your back and shoulders.

Ergonomic W-Contoured Seat

The unique W-shaped design mirrors your natural curves to cradle your hips and thighs. It evenly distributes weight, neutralizing tailbone pressure and promoting healthy circulation for all-day comfort.

3.1" High-Density Molded Foam

Perfectly balancing plush comfort and firm support, this premium one-piece foam is engineered to retain its shape and resist sagging, even after hours of daily use.

Fully Customizable Comfort

From the 2D headrest to 4D armrests and adjustable tilt tension, the Flex offers complete control. It’s precision-engineered to support your dynamic posture, making it easy to switch from work to rest.

Built to Last

Experience plush comfort that doesn’t fade. The High-Density Molded Foam is crafted to stay soft and supportive, retaining its original shape and elasticity without deforming over time.
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
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.