Cotton is a natural fiber that is soft, comfortable and breathable. Lycra/ spandex provides excellent fit and superior stretch and recovery. Used in all FootJoy socks. FootJoy reinforces the heel of its socks by double-layering the heel area which provides support and cushioning in a known high abrasion area. Comfort Seam is FootJoy’s exclusive enclosed toe seam for advanced comfort and fit. Comfort Seam is found in all FootJoy socks.