ECCO Performance Rubber EPR 4.0. Receptor technology. Direct-injected PU midsole including toe protection and side stabilizer frames. Anatomical comfort footbed. Upper of rich yak leather. Benefits Excellent grip traction and durability for a broad range of terrains. Stability guidance and dynamic support through the three phases of everystep. Great comfort protection and stabilty for your outdoor adventures. Excellent wear comfort even in rough conditions. At least three times stronger than normal leather.