Icebug Men&#39;s Pytho2 BUGrip Running Shoe,Icebug" /> 100% Nylon and thermoplasic polyurethane Rubber sole Nylon shank and TPU stabilizer provide stability rare in shoes this light and flexible Nonabsorbent uppers ensure little added weight even in wettest conditions PU exoskeleton cage captures foot solidly to retain security even on radical terrain Special shock absorbing inserts at heel and forefoot