The hidden kingfoam inserts in the shin and ankle area of the Footprint Shin Socks protects from the shinners and ankle bruises. Doesn't look or feel like a lame old school shinguard. These things offer extreme comfort featuring double padding under the foot and the kingfoam inserts are form fitting. You won't notice they are there. Kingfoam is a formulation of ARTi-LAGE (Artificial Cartilage Foam), the world's newest and most impact absorbing material. Tested and approved by the world's top athletes.