Spenco PolySorb Insoles help reduce pain associated with Sever’s heel, heel spurs and foot impact. Energy return helps reduce fatigue for better performance. Best for use in tennis, basketball and training shoes with removable insoles. Custom-fitting memory foam layer adjusts for customized cushioning for the entire foot. Lightweight PolySorb® absorbs shock and supports the arch and heel. Four-way stretch fabric with Silpure Antimicrobial helps prevent blisters while controlling odor. Durable SpenCore™ provides the ultimate in long-lasting cushioning through spring-like shock absorption. Additional heel strike adds maximum cushioning at heel strike. Unconditionally guaranteed for one full year.