The Arch 2000(TM) insole provides stability, support, and full-length/lightweight cushioning. Dual layer cushioning provides the maximum amount of cushioning possible. The inner cushion is a layer or PORONA(R) Cellular Urethane, which provides superior shock absorption for the entire foot. PORONA(R) is lightweight and durable; it does not harden like PVC foam, does not break down like Latex foam, or take a compression set like EVA foam. The anatomically shaped arch support and extra deep heel cup combine to deliver maximum support and stability. The Biostatic(TM) top cover helps fight against unwanted odors. By controlling the amount the foot slides across the insole&';s surface, the anti-friction top cover helps prevent blisters and keeps feet cooler and drier.