Soft on one side and a tough, black hard side encasing a 1/4'' gel in the middle. -Reduces temperature to the foot up to 41 deg. -Great shock absorption & ultra light weight. In most cases you will see an immediate, noticeable improvement. Horse Trax has over 5,000 PSI reduction of impact, to the bottom of the foot. Horse Trax tested 67% better on average than any other impression material, hoof packing or pad on the market!