Our Primaloft Lightweight socks utilize Primaloft polyester yarn to keep your feet warm in a variety of temperatures, all without overheating or being exessively bulky. Primaloft polyester yarn offers the best thermal performance to weight in a wide temperature range. Soft terry-loop footbed and toe provide comfort and warmth for transition weather. Great for transitional weather and offers great moisture wicking and thermal regulation. Calf High - 18cm/7in with seamless toe construction. Made in Italy.