Master the cold with confidence in RefrigiWear s Iron-Tuff Socks, engineered for rugged performance and lasting comfort. Crafted from a premium blend of 41% Merino wool, 35% acrylic, 23% nylon, and 1% Lycra, these thermal socks deliver natural warmth, moisture-wicking comfort, and resilient stretch. The welted top ensures a secure, non-slip fit, while nylon reinforcements in the heel, toe, and underfoot enhance durability where it s needed most.