User-friendly gas-lift seat height adjustment. Ergonomically designed seat and back rest with robust integral foam cushions, resistant to weak acids and alkalis, easy to wash. Extra high back rest, height 520 mm, with integrated lumbar support, floating back rest with continuous tilt adjustment and 10-way height adjustment. Seat with pelvic support and rounded front edge. Five-castor stable tubular steel base frame, even travel, non-tip and non-judder with abrasion-resistant plastic base gliders