Subzero Merino Socks are knee-high socks designed for outings where the cold quickly creeps up through your feet. Their 51% merino wool blend provides warmth, comfort, and breathability, making them suitable for more than just winter outings. The technical weave helps the sock stay securely in place inside wading boots. The polyamide-reinforced outer surface is designed for greater durability. Choose your size based on your shoe size, leaving enough room in the boot so the foot isn’t constricted.