Carhartt's FORCE work crew sock features FastDry with 37.5 Technology, which dries fast to keep your feet at an ideal temperature. 37.5 Technology is inherent in the yarn; so it never washes out. The odor-fighting sock is built with stretch material and a braced arch, which add stability and holds the sock in place. Mesh cooling panels promotes air ventilation. Reinforced heel and toe provide added durability for longer wear. Made in USA.