The DeFeet Thermeator 6″ socks start with THERMOLITE®, a special hollow core performance fiber that provides warmth without adding extra weight. Thermeatorâ„¢ is 30% lighter in weight compared to a similar knit sock constructed of Merino Wool also It also has a faster drying rate. The Thermeatorâ„¢ quickly wicks moisture away from skin and is lightweight for less bulk inside your shoe. Thermeatorâ„¢ is intended for athletes who love to ride outdoors regardless if it is wet, cold or windy. It's flexible and thrives in cold, damp conditions….