Office chair Topstar Sitness 10 Green — ergonomic task chair, adjustable height, lumbar support

Topstar Sitness 10 Green is an ergonomic task chair engineered for daily desk use. It combines a compact footprint with a flexible Sitness mechanism that encourages micro-movements while seated and provides integrated lumbar support. The chair features height adjustment and a contoured seat to support neutral posture during extended work sessions in home offices and professional workplaces.

Advantages

The Sitness mechanism promotes active sitting by allowing slight rocking and pelvis rotation, which helps maintain spinal alignment and reduces static load on the lower back. Adjustable seat height enables correct desk positioning and leg clearance. The contoured seat surface and built-in lumbar support distribute pressure and improve sitting comfort without additional accessories.

Suitable for

• Home office workstations and study desks
• Office environments with moderate daily sitting time
• Users seeking improved posture and dynamic sitting
• Task-based work such as computer use, meetings, and paperwork

Key specifications

• Ergonomic Sitness mechanism for active sitting and pelvic movement
• Adjustable pneumatic seat height
• Contoured seat with integrated lumbar support
• Stable five-star base with smooth-rolling casters
• Upholstery in green fabric; durable, breathable surface

How to use

Adjust the seat height so your feet rest flat on the floor and your knees form approximately a right angle. Sit back against the integrated lumbar support to maintain the natural curve of the lower spine. Use the Sitness mechanism by allowing small forward and backward movements; this supports circulation and reduces static muscle load. Roll the chair to reposition at your desk and lock your work height once adjusted for stable typing and writing.

Usage recommendations

For best ergonomic effect, combine correct seat height with regular short breaks and small posture adjustments throughout the day. Keep the casters clean and use on a suitable floor surface or chair mat to preserve mobility and base condition.