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The merino wool and silk blend fabric in the Columbia Titanium Mighty High Performance Hiking Sock regulates your foot's temperature during long trail days. The fabric also wicks away moisture and breathes to keep you warm in the cold and keep you cool in the heat. These crew socks also feature a ventilated panel for extra moisture control as well as left and right fit technology for the best fit possible. Even if your daily trail mileage reaches into the teens, the Mighty High sock's flat toe seam won't rub on your foot and give you blisters. Please note: these socks are labeled "Slighty Imperfect" by Columbia)