Our knee-high heavyweight socks are warm enough for the coldest days out. Knee-high coverage eliminates gaps in layers, making these the best winter cycling socks for combining base layers, pants, and boots. The Merino wool-blend fabric wicks moisture away from feet to keep them warm and dry. These deep-winter bike socks are toasty enough on their own for super-cold days, and can be layered with our lightweight socks for a vapor barrier in deep cold.