Made with 75% ultra-wicking m.d. acrylic, 15% nylon, and 10% spandex for exceptional comfort and strength. all of our socks feature our "stretch-to-fit" sizing system and our 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. we deliver superior quality and high-tech comfort in every sockguy sock we make. we guarantee it