Sitting stool Topstar Sitness 20 SI69G22 anthracite – ergonomic active-seating stool

The Topstar Sitness 20 SI69G22 anthracite is an ergonomic active-seating stool designed to encourage movement and support an upright posture during seated tasks. Compact and light, the stool provides a contoured seat and a tilting mechanism that allows small, controlled micro-movements. It is suitable for environments where short to medium duration seating is required and where dynamic posture support can reduce muscle tension and promote engagement while working or studying.

Advantages

The stool’s dynamic seat construction enables natural sway and small adjustments that activate core and back muscles. Its minimal footprint and lightweight frame make it easy to move between rooms or workstations. The anthracite finish offers a neutral look that integrates with a variety of interiors. Designed for ergonomic use, the Sitness 20 supports improved spinal alignment compared with static seating and can help reduce stiffness from prolonged sitting.

Suitable for

• Home offices and study areas
• Standing desk companions for short breaks from standing
• Creative studios and workshop benches
• Reception areas and meeting rooms for flexible seating

Key specifications

• Seat type: contoured active seat with tilt function for micro-movements
• Height adjustment: gas lift mechanism with stepless adjustment within a compact range suitable for short to medium tasks
• Base: stable five-star base with casters for mobility
• Material: durable upholstery in anthracite and a robust plastic/metal support structure
• Intended use: ergonomic active seating for short to medium duration tasks

How to use

Adjust the seat height so your feet are flat on the floor and your knees are roughly at a right angle. Sit centered on the contoured seat and allow the tilting mechanism to move freely; make small, frequent adjustments to engage trunk and leg muscles. Use the casters to reposition the stool as needed. For desk work, set the stool height so your forearms rest comfortably on the work surface without hunching the shoulders.

Usage recommendations

Use the stool for sessions ranging from 20 minutes to a few hours, alternating with other seating or standing to maintain balanced muscle activity. Regularly check caster function and gas lift performance and avoid excessive load beyond intended single-person use.