The Fox River Trail Pack Socks are medium weight crew sock. The soft warmth of Merino wool blends with the smooth, lightweight durability of acrylic in this breathable, moisture managing sock. Made in the USA Spandex compression arch holds form and provides support Fully thermalined design absorbs shocks and insulates Reinforced toe and heel add comfort and longer product life Medium weight Crew 50% acrylic, 31% nylon, 17% Merinowool blend, 2% spandex Care: Machine wash inside out in warm water, no bleach. Tumble dry low. Do not dry clean.