Made with 75% Ultra-wicking Micro Denier Acrylic, 15% Nylon, and 10% Spandex for exceptional comfort and strength. Features "Stretch-to-Fit" sizing system and exclusive "Easy-fit" cuff for a PERFECT FIT every time on any foot. These features create superior softness and comfort and help eliminate blisters and hot spots. Also feature a double stitched heel & toe for added strength and durability. Superior Quality and High-Tech Comfort in every SockGuy sock. Guaranteed for 1 year.