The Fox River Heavy Weight Woodsman Sock Style # 7889 is made with Thermolite® provides thermal insulation and wicks moisture away. Breathable, non-terry front vamp panel eliminates bunching. Thermalined leg and sole for shock absorption and added insulation. Reinforced heel and toe for extended wear. Smooth, flat toe seam. 53% Thermolite® polyester, 21% nylon, 14% worsted wool, 11% acrylic, 1% spandex.