These Bunga Gel Disks are made of Bunga BM Visco elastic gel. They will reduce shock, vibration, pressure and shear force. These are used by athletes and others over any part of the body where they wish to reduce these disturbing forces. Simply place the discs against the skin, underneath either socks or stockings. The natural stickiness of the gel will reduce the chance that the padding will move. These are washable and reusable, bacteria resistant and hypoallergenic. They are primarily used to break in new skating boots or other footwear in the sports of ice hockey, figure skating, rollerblading, rollerskating, speed skating and hiking boots.