4D Sitness stool, seat HxW 530 - 640 x 375 mm, grey. Supplied = partially assembled. Seat material = 95% polyester, 5% elastane. Type of height adjustment = gas spring. Frame material = plastic. Frame colour = grey. Foot plate diameter = 360 mm. Seat design = ergonomically shaped. Seat width = 375 mm. Seat depth = 360 mm. Max. load = 110 kg. Period of use/day = up to 4 hours. Product type = office stools. The lifestyle stool for dynamic sitting. Infinitely adjustable seat height using the lever at the side of the seat. Ergonomic seat. Trains the back and spine, takes the strain off the spinal column. Guarantees freedom of movement and invigorates the circulatory system. Improves the ability to concentrate and improves performance. Newly developed alternative seating, actively encourages more movement and free, upright posture when seated. The unique Sitness technology ensures three dimensional sitting and therefore keeps you in motion, even when seated. The unique Sitness technology de