The Hike+ Mountaineer Mid Calf is icebreaker's warmest sock ideal for braving the coldest weather conditions. Made with a warm, breathable and naturally odour-resistant merino wool blend, this sock features a highly dense, fully cushioned design that's anatomically sculpted for a precise fit. Key support zones in the Achilles and instep help keep the sock in place. Reinforcements in the heel and toe are designed to enhance durability, while the seamless toe helps reduce bulk and friction for added comfort. Inspired by nature, icebreaker harnesses the performance qualities of natural fibres to offer an alternative to clothing based on petrochemical synthetics. Merino wool is an annually renewable fibre that naturally resists odors, keeps you cool when it’s hot and warm when it’s not, and lets your skin breathe for comfort all day, every day.