Made to adapt to your rhythm, pairing a breathable mesh back with a comfort seat in 55 or 70 mm foam to ease pressure through long stretches of focus. Its synchronous mechanism keeps movement balanced, while the EVERY LINE Autolift self-adjusts backrest tension to your weight —no knobs, no guesswork, just posture that feels right. Add FlexTech to unlock gentle multi-directional micro-movements that encourage circulation and active sitting, and fine-tune support with 4D T-armrests and a height-adjustable lumbar support. Infinitely variable seat height, color-through plastics in black or white, and pure, recyclable materials make it a smart choice for sustainable, modern workspaces that value comfort, efficiency, and long-term confidence

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Features

Plastic parts
Colour maintained throughout, black or white.
Backrest
Mesh-covered backrest.
Seat upholstery
55 or 70 mm foam. Comfort seat.
Mechanism
- GDEV177E7: Synchronous mechanism, lockable, with FLEXTECH Inside. Large opening angle of up to max. 106° with additional side tilt of 5°. Backrest lockable in 4 positions. - GDEV177E2: Autolift-System (with synchronous mechanism), with automatic weight adjustment (45-120 kg). Backrest lockable in both forward and backward position, opening angle between seat and back up to 105°. - GDEV197E1: Synchronized mechanism, with self-adjusting weight (50 - 120 kg). Backrest locking possible.
Seat height adjustment
- GDEV177E7: Seat height adjustment infinitely variable from 415 - 540 mm. Self-supporting safety gas spring. - GDEV177E2: Seat height adjustment infinitely variable from 410 - 515 mm. Self-supporting safety gas spring. - GDEV197E1: Progressive seat height adjustment from 640 to 920 mm.
Materials
All materials are pure and recyclable.
4D armrests
Height, width, and depth adjustable, rotatable, soft surface.
Lumbar
Height-adjustable lumbar support.
Glides
- Chairs are factory-equipped with Hard Casters, recommended for textile surfaces such as carpet or rug. For applications on hard floors (wood, tile, vinyl, polished concrete, among others), it is recommended to select Soft Casters to prevent surface damage and ensure controlled rolling. Soft Casters are available as an optional upgrade at an additional cost.
Seat slider

Available as an enhancement to the synchronized mechanism, FlexTech introduces controlled micro-movements in multiple directions, supporting dynamic sitting.
It improves circulation and muscle tone contributing to postural wellness during extended use.

Self-adjusting mechanism that automatically adapts backrest tension based on the user’s weight.
Its compact, intuitive design eliminates the need for manual adjustments, promoting an ergonomic posture with no active intervention.