Premium leather uppers. Dual elastic gores for easy on and off. Smooth leather linings will keep your feel cool and dry. Poliyou® core provides superior shock absorption and energy return to reduce foot fatigue. Bio Comfort Sock Liner System is biomechanically designed for lasting comfort. Steel shank construction helps maintain strength and integrity for the life of the shoe. Flexible rubber outsole is durable, slip resistant, and shock absorbent.