The Heavy Duty Insole provides the best combination of shock absorption and energy-return with targeted cushioning and support for standing or walking on hard surfaces. It offers comfort and fights fatigue to provide comfort. Polysorb polyurethane foam supports the arch and heel while a Spencore material heel pad cushions strike impact and reduces pressure. Compared to anti-fatigue mats Spenco insoles provide heel-to-toe constant cushioning and support regardless of location. The Spenco Heavy Duty Insole will cushion stabilize and support your foot right out of the box. Available in seven sizes to ensure a proper fit this insole is unconditionally guaranteed for one year. To use simply remove the existing insole from your shoe and use it as a guide to trace and trim the replacement insole. Insert the insole into your shoe with the green side up. The green low-friction top cloth reduces friction while Silpure antimicrobial technology helps reduce odor. Hand wash in warm water and air dry as needed.