Stepless seat height adjustment with top lift. Comfortable seat with thick upholstery. Highly abrasion-resistant polyester cover, hard-wearing fabric (80,000 abrasion cycles). Extra high backrest. 3-way lockable Synchro-Relax mechanism. 5-way height-adjustable armrests with soft pad support. Seat depth adjustable in four stages. Equipped with load-dependent braked double safety castors for carpeted floors. This means that the chair only rolls under load; when unloaded, the castors brake to prevent the chair from rolling away unintentionally. This item is supplied disassembled and can be assembled in just a few simple steps. No assembly is required for gas springs, chair castors, footrests, etc.