Lightweight cushioning protects against impact and reduced friction helps prevent blisters. Fits in any shoe or boot and over custom orthotics. Full Length cushions and comforts heel-to-toe. SpenCore® Material Exclusive cushioning layer absorbs shock and impact to provide maximum comfort. 7 Sizes for better overall fit. 4-way Stretch Fabric with Silpure Antimicrobial helps prevent blisters while controlling odor. Unisex Flat Insole by Spenco