Footprint Painkiller Kingfoam Shin Socks 7-9 [Black/Grey] Single Pair Shinners are now optional.you don't need to get them anymore. Simply put you can spend all your time focusing on your tricks, not on pain. These special FP socks are embedded with ARTIFICIAL CARTILAGE FOAM, the world's most impact absorbing material. They look and feel like normal socks but when the board hits the ankle bone or the shin, you're good.