Fox River Wick Dry Explorer Sock 40% Nylon/27% Merino Wool/27% Acrylic/4% Polyester/2% Spandex Made in US No Closure closure Machine Wash A special grade of Merino wool that shares all of the characteristics of classic wool such as thermoregulation, breathability and odor control. It's also luxuriously soft and comfortable. Unlike coarser grades of wool, Merino is much less prone to itching Our exclusive Wick Dry technology quickly draws moisture away from your skin so your feet stay dry and comfortable. Removing the moisture build up reduces hot spots and friction that causes blisters Our URfit System provides the ultimate personalized response fit combining memory knit compression, a contoured rib top and spandex compression zones Knit to fit women's narrower feet and a more tapered toe pocket. Additionally, a shorter leg length makes a more flattering fit Smooth, flat toe seam doesn't rub or irritate during wear. Plus, our smooth, flat toe closure technique adds durability so it stretches every way you do without unraveling