Spenco Heavy Duty Insole - Proven cushioning and support for standing or walking on hard surfaces. Ideal for: work shoes or boots. 4-Way Stretch Fabric with Silpure Antimicrobial helps prevent blisters while controlling odor EVA Forefoot Pad provides superior cushioning and energy return for people on their feet all day SpenCore Material a 5/32 layer of this material absorbs shock and impact Lightweight POLYSORB Polyurethane Foam provides arch and heel support SpenCore Heel-strike Pad provides extra cushioning and shock absorption in the heel Size 2: Women's 7-8/Men's 6-7 Size 3: Women's 9-10/Men's 8-9 Size 4: Women's 11-12/Men's 10-11 Size 5: Men's 12-13