Why are there additional socks? Well, you might wear one out or you might lose one in the wash (like those pesky socks.) Or, you might want different sock for different coloured clays like porcelain and earthenware. If you work with wet sticky clay then you know how a paddle wants to cling to the surface. A sock will let the paddle release quickly when you slap the clay. Made of stretchy polyester. Comes in pairs., Sock colours vary.