Thorogood Shock Zone Insoles feature dual density polyurethane. One density under heel and ball strike areas provides excellent shock absorption and a second density under balance of food provides all day cushioned comfort. They have perforations in the ball and arch creating an air flow zone where you need it most.

Sizing:

• Medium: For 8 thru 9 1/2
• Large: For 10 thru 11 1/2
• X-Large: For 12 thru 13 1/2
• 2XL: For 14 thru 15