Office chair Topstar CHEFSESSEL SITNESS DIRECTOR 10 (SK739T A80) — ergonomic manager chair

Topstar CHEFSESSEL SITNESS DIRECTOR 10 is an ergonomic manager chair designed for daily professional use. The chair combines a high backrest with the brand’s SITNESS mechanism to promote active sitting and continuous micro-movements that support the spine. Adjustable features allow users to adapt the chair to their body shape and working habits, making it suitable for long work sessions in offices or home workplaces.

Advantages

The SITNESS mechanism enables dynamic sitting by allowing controlled, multi-directional movements of the seat and backrest, which helps reduce static muscle load. An adjustable backrest height and tilt, combined with customizable armrests and seat depth, provide personalized ergonomics. The high back design supports the upper back and shoulders, while the robust construction ensures stability for daily use.

Suitable for

• Office managers and executives who sit for extended periods
• Home office users seeking ergonomic seating for long workdays
• Workstations requiring a supportive high-back chair with active-sitting features

Key specifications

• Ergonomic mechanism: SITNESS active-sitting system for dynamic support
• Backrest type: high backrest for upper back and shoulder support
• Adjustability: backrest tilt and height adjustment; seat depth adjustment
• Armrests: adjustable for height and/or angle to reduce shoulder strain
• Base and casters: sturdy five-point base with smooth-rolling castors suitable for office floors
• Upholstery options: durable fabric or material designed for frequent use

How to use

Adjust the seat height so your feet rest flat on the floor and knees are at approximately a 90° angle. Set the seat depth so there is a small gap between the front of the seat and the back of your knees. Use the backrest height and tilt adjustments to position lumbar and upper back support where it feels most effective. Modify the armrest height and angle so your forearms are supported with relaxed shoulders. Allow the SITNESS mechanism to move naturally during work to maintain micro-movements that reduce static load.

Usage recommendations

For best ergonomic effect, combine correct chair adjustments with regular short breaks and posture changes. If using on a hard floor, consider suitable casters or a chair mat to protect the floor and ensure smooth mobility.