The T2 Men"s Light Hiker was designed for long hikes and rugged conditions where moisture and warmth are an issue. Made with Merino Wool that provides warmth without overheating the foot. The cushioning helps the sock fit snuggly in your boots and protect against irritation while the mesh venting along the top of the sock allows for more air flow to the foot keeping you dry. Ea. LYCRA® ensures this sock stays up in your boots without slipping down to your toes.