35° Below Thermal Socks with thicker insulation is designed and enhanced with woven, aluminized fibers to help keep the feet warm in the cold. The socks use the same amazing fabric technology developed from aerospace to keep feet warm and comfortable in the coldest conditions. The ribbed stitching and thicker insulating material provide excellent cozy, cushion padding for all outdoor and indoor activities. Small/medium 35 Below Thermal socks come in steel grey with aluminized fibers on the foot bed. Large 35 Below Thermal socks come in black with copper colored aluminized fibers on the foot bed. 35 Below Large Black Polyester/Spandex Blend Thermal Base Layer | 59822
