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Comprised of 55% recycled and renewable materials, the Spenco Earthbound replacement insoles offer firm support, motion control and cushioning for athletic and training endeavors. 3-Pod™ cushioning system follows the path of heel strike and foot planting, absorbing shock and helping prevent over pronation. PolySorb® stability cradle is made with recycled nylon and supplies arch support and deep heel cupping for increased stability. Metatarsal arch support offloads pressure from the ball of foot to help relieve forefoot pain. Forefoot crash pads provide extra cushioning under the ball of foot for smooth transitions. Topsheet features recycled fabric with Ultra-Fresh Silpure antimicrobial treatment to deter odor development. Full-length cushioning is supplied by middle section of recycled EVA and cork, upping the comfort factor. To use, remove existing footbeds, place them over top of the new footbeds, trace around edge with pen at toe area, trim off excess and slip inside. Footbeds can be hand-washed with warm water and air dried.