The Darn Tough Coolmax Boot Full Cushion Sock is a mid-calf synthetic boot sock knit with Coolmax polyester fiber as the base. Coolmax is engineered specifically for moisture transport — it pulls sweat off the skin and pushes it to the outside of the sock faster than traditional synthetic yarns. High-density cushion runs under the foot for shock absorption in the boot, and True Seamless toe construction eliminates the toe-box seam.
Mid-calf height protects the lower leg from boot tops, and the 60% Coolmax Polyester / 31% Nylon / 6% Acrylic / 3% Lycra blend keeps the sock fast-drying and compression-stable over long shifts. This is the pick for hot-weather hiking, summer work sites, and anyone who runs warm in merino — same Darn Tough cushion and durability, different base fiber.
Every pair is knit at the Darn Tough family mill in Northfield, Vermont, and carries the same unconditional lifetime guarantee as the rest of the line.
