This insole use a blend of materials to achieve the support need for feet hard at work. Keeping ones feet feeling good all day long. Performance Foam (PU) - absorbs shock for ultimate comfort. Dual Density Design - Soft gel in the heel and forefoot absorbs shock for all day relief. Arch cushion supports the arch for greater overall comfort. Top cloth helps reduce friction and prevent blisters. Perforated for breath-ability. Hand washable in cold water, air dry only.