Farm to Feet Blacksburg Ultralight 1/4 Crew Water Socks 37% PTFE Nylon 61% Nylon 2% Spandex Made in US Friction-Free Technology utilizes American-made nylon to keep your feet cool, dry, and protected from abrasion Advanced construction of hidden nylon plaiting creates a smooth exterior and a low-profile fit that is ideal for technical and sport socks Flat knit construction provides better ventilation and reduces bulk for a better fit, while the smooth seamless knit feels wonderful next to the skin Circumferential compression from the top through the arch creates a precise, comfortable fit that helps support the foot throughout the day Reinforced construction and low-stress seam placement reduce wear and tear, increasing the life of the sock