"ComfortSof crew socks were designed with Lycra®/ Spandex which provides superior stretch recovery. Soft Natural Fiber Cotton is a natural fiber that is soft, comfortable and breathable. Superior Construction Lycra/ spandex provides excellent fit and superior stretch and recovery. Superior Comfort Comfort Seam is FootJoy’s exclusive enclosed toe seam for advanced comfort and fit. Secure Fit FootJoy reinforces the heel of its socks by double-layering the heel area which provides support and cushioning in a known high abrasion area."