FoxRiver Outdoor Wick Dry Therm-A-Wick Over-The-Calf Liner Socks 50% Thermolite polyester/49% nylon/1% spandex Made in US Looking for a warm liner that won't add weight or bulk, but keeps Heat and removes moisture with WICK dry? Look no further, Thermolite is the answer Thermolite's hollow Core fibers Heat up quickly and hold in Heat Smooth, flat-knit construction provides lightweight comfort Smooth, flat comfort toe seam; proudly made in the USA Looking for a warm liner that won't add weight or bulk, but keeps Heat and removes moisture with WICK dry? Look no further. Thermolite is the answer. Thermolite's hollow Core fibers Heat up quickly and hold in Heat Smooth, flat comfort toe seam; proudly made in the USA