Spenco RX ThinSole Orthotics are designed to support your foot's arch and absorb the shock of everyday activity without added bulk. Adjust arch with a heat gun. Allow insert to cool before applying to foot or placing in shoe. Fiberglass composite shell is bonded to closed-cell nitrogen-injected SpenCore and covered with four-way stretch fabric with Silpure antimicrobial that helps prevent blisters while controlling odor. Thin enough to fit in dress or casual shoes. Sizing: Size 4 Women's 11 - 12.5 Men's 10 - 11.5
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