Office chair Topstar Sitness 15 ST19U G21 with armrests, red fabric upholstery

The Topstar Sitness 15 ST19U G21 is an office chair with integrated Sitness movement technology, red fabric upholstery and fixed armrests. Designed for daily desk use at home or in the office, it supports micro-movements of the pelvis and spine to promote active sitting and increased comfort during prolonged periods of work.

Advantages

The Sitness mechanism encourages natural body movement while seated without complex adjustments. Red fabric upholstery provides a breathable surface suitable for everyday use. The chair includes armrests and a five-star base with castors for mobility and stable support.

Suitable for (tasks / use cases)

• Daily office work at a desk
• Home office and study
• Tasks that benefit from active sitting and frequent posture changes

Key specifications

• Brand: Topstar
• Model / MPN: ST19U G21 (ST19UG21)
• EAN: 4014296111605
• Upholstery: red fabric
• Armrests: fixed armrests
• Mechanism: integrated Sitness movement
• Base: five-star base with castors

How to use

Sit on the chair with your feet flat on the floor and adjust seat height so your knees are approximately at 90 degrees. Use the natural Sitness movement feature by allowing small pelvic and trunk adjustments while working—no additional controls are required for the movement function. Use the armrests to support the forearms during typing or reading to reduce shoulder strain.

Usage recommendations

For best results combine regular short breaks and simple stretches with the chair’s active sitting function to reduce static loading during extended work sessions.