Leitz Ergo Active Standing Stool with Unique Dual Density Foam Comfort Cushion, Height Adjustable 57 to 82cm, 100% Post Consumer Recycled Seat Cover, Supports 110kg, Ergo Range, Dark Grey, 65450089The 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