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Poron Dual Layer Insole for Shoes - High performance twin benefit urethane foam. Combines the curability and shock absorbing qualities of Poron 4000 (Grey / High Performance ) with the softness and comfort of Poron 94 (Pink / Slow Memory inner soles) resulting in a superior dual layer foam Inserts for shoes made from 100% microporous and cushioining Poron foam --- Durable, highly regarded performance, shock absorption material. These Microporous polyurethane foam insoles keep moisture and sweat away from socks and feet.