The patented moisture control system in Wigwam's Hiking/Outdoor Pro Socks works to keep feet warm, dry, and blister-free on your outdoor adventures. X2O acrylic contains Chitosan, a natural odor defense, so feet stay fresher longer. Hiking/Outdoor Pro Socks offer a stay-put leg, cushiony sole and leg, fortified heel and toe, abrasion-resistant protection, and a seamless toe closure. Made from a comfy, moisture-wicking blend of 40% olefin, 36% X2O acrylic, 20% stretch nylon, and 4% spandex fabric. Made in the USA.