The Spenco PolySorb Walker/Runner replacement insoles offer firm support and cushioning for active pursuits and everyday use. Topsheet features 4-way stretch fabric to reduce blister-causing friction and has an antimicrobial treatment to deter odor development. Full-length cushioning is supplied by middle section of air-injected proprietary material, upping the comfort factor. Molded polyurethane stability cradle supplies arch support and deep heel cupping for increased stability. Neoprene heel crash pads provide extra cushioning to dampen heel strikes. 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 shoes. Footbeds can be hand-washed with warm water and air dried.