Knit from a premium alpaca blend with a hairy and light hand, these socks provide effortless warmth and comfort throughout the coldest months of the year. What makes alpaca wool special? Alpaca is warmer, stronger, lighter, and softer than other quality contenders for high-end luxury materials. It won’t shrink or pill if given correct care. Insulating, hypoallergenic, and even water-resistant, alpaca absorbs little humidity from the surrounding environment. Size Guide: Medium (M): Women's US Size 6 - 10 Large (L): Men's US Size 7 - 12