This is a comfortable fit made with baby alpaca (fiber from the very first shear of an alpaca), one of the finest and most luxurious fibers in the world. The sizing on these socks is easy and stretchy to fit many different kinds of feet, without compromising quality and being too big or too small. This is a high quality sock suitable for everyday wear, hiking, cozying up at home, and both warmer and cooler weather. Peruvian alpaca is hypoallergenic, soft, and silky, and alpaca fiber production is one of the most sustainable fiber production processes. Alpaca is a natural technical fiber, it has a breathable, unique thermal quality that allows air circulation for the foot to prevent sweating in warm weather, and in cold weather, contains heat for warmth. Materials 75% baby alpaca, 23% nylon, 2% spandex Size See size guide below Origin Peru