Spenco PolySorb Walker RunnerThe Spenco PolySorb Walker/Runner Insole provides cushioned protection and arch support. Silpure Antimicrobial top cloth helps reduce friction and heat build up with its four-way stretch nylon construction, preventing blisters and calluses. SpenCore™ heel-to-toe cushioning adds full coverage protection. SBR rubber cushions the forefoot and provides extra protection against shock abrashion. Spencore™ heel-strike pad offers focused cushioned protection. Lightweight, contoured POLYSORB™ polyurethane foam heel cup and contoured arch support cradle the foot and protects the target areas. Ideal for running, walking, training and sports activities.