What's the difference between the All Purpose Insoles (AP) and the Extreme Sports Insoles (ES)? The AP insoles are one layer of polyurethane on both sides and the ES insoles are two layers of polyurethane on both sides providing an extra layer of protection and making them extremely strong to prevent the glycerin from escaping under high impact. The ES insoles also hold their shape better long term when used for extreme activities and high impact work environments. Both AP insoles and ES insoles have the same amount of glycerin.

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