Spenco Rx&reg; Ball of Foot Cushions Large, 11" to 12" Women's Size, 12" to 15" Men's Size 4-way Stretch Fabric with Silpure Antimicrobial helps prevent blisters while controlling odor. Metatarsal Arch Cookie specially shaped cushion to provide comfort and support where the metatarsal SpenCore Material Exclusive cushioning layer absorbs shock and impact to provide maximum comfort.