Alpaca is one of the world's rare prestige fibers, and its premium reputation is well-earned. Warmer than wool, super-tough due to its long fiber length and with a uniquely soft and silky handfeel, these luxury socks will keep your feet cozy in any kind of weather. These lightweight stretch socks are blended with elastic to move comfortably with your foot. Quality Peruvian Alpaca. Unisex Sizes: S/M or M/L. You will love these socks! Machine washable.