Made with 75% Ultra-wicking Micro Denier Acrylic, 15% Nylon, and 10% Spandex for exceptional comfort and strength. ALL SockGuy socks feature a “Stretch-to-Fit” sizing system and an 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. We also feature a double stitched heel & toe for added strength and durability. SockGuy delivers Superior Quality and High-Tech Comfort in every SockGuy sock made.