The unique, triangular shaped Dual Density Foam (DDF) comfort seat distributes weight evenly across the pelvis, surrounded by soft foam cushion to reduce pressure on thighs similar to a saddle stool; 9cm thick seat for ultra comfortable sitting or leaning The rounded wobble base encourages active movement by swivelling and rocking to help strengthen your back and core whilst working, remains strong and stable at any height; the non-slip rubber base prevents stool from slipping and causing damage The wobble stool is height adjustable from 57 to 82cm with a release button underneath the seat; carry handle makes it easy to move from room to room supports up to 110kg, compact design to store under a desk and is quick and easy to assemble The stool arrives in plastic-free packaging, with a 5 year guarantee; developed together with the German IGR Institute for Health and Ergonomics according to DIN 26800 EN ISO 15537 with ergonomic comfort in mind, TÜV and GS certified for safety Contents: 1 x Leitz Active Standing Stool, Dimensions (WxHxD): 38 x 82 x 38 cm, 61g, 100% recycled seat cover with OEKO TEX 100 certification (passed safety tests for the presence of harmful substances), Dark Grey, Ergo Range, 65450089