NON adhesive Neoprene foam. This size is ideal for making tight turns and giving a grippy coating with a minimal effect on thickness. It is also nice for giving a uniform look when glued over outfitting that is a combination of several pieces.
If you are putting in knee blocks to the outside of your knees this is the ultimate finishing touch. A piece of this wrapped throughout the whole curve of the knee block and all of the thigh hook.