The Head Grid Indoor Shoe features Head's Cooling System and Head's HyBrasion Technology. Head's Cooling System is an innovative, dynamic "climate control" system within the shoe that maintains ultimate breathability by absorbing and releasing excess heat build-up. Head's HyBrasion Technology is a high abrasion compound rubber formula specifically designed for the high stress areas of shoe soles. It provides superior toe drag resistance and hard wearing resistance on any surface.