Indestructible yet flexible plate provides optimal arch support The dual layer cushioning system provides the maximum amount of cushioning possible. The inner cushion is a layer of PORON Cellular Urethane, which provides superior shock absorption for the entire foot. The bottom cushion is a soft layer of long-lasting, polyurethane foam,that adds an extra layer of cushioning. Anti-blister top cover keeps feet cooler & drier while Biostatic treatment inhibits bacteria, fungus, & foot odor Color: Red