FootJoy Men's Low Cut Golf Sock; Assorted Pack of 3 Black & 3 White Cotton is a natural fiber that is soft, comfortable and breathable. Lycra/ spandex provides excellent fit and superior stretch and recovery. Comfort Seam is FootJoy's exclusive enclosed toe seam for advanced comfort and 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.