This is Darn Tough's burliest hunting sock. When it's crazy cold, but you're still going out, this is your sock. Extra heavy terry loop construction protects your entire foot and leg for maximum warmth. A performance fit means no slipping, no bunching, no hesitation. Here's to staying comfortable while you wait. Cooling vents improve breathability and heat regulation in your hunting boots. Reinforced footbeds improve the lifetime comfort, durability, and fit of our socks. Merino Wool wicks moisture and dries fast to keep feet comfortable when you're out in all weather. Darn Tough's warmest socks - heavyweight socks regulate heat, transfer moisture, and provide steady comfort in cold weather. Thestillin Still Made in Vermont, USA is personal. Darn Tough knit all of their socks at their VT-based Mills. Size and fit Hunting over the calf socks average 17 in. from heel to cuff - expect them to cover the leg to just below the knee Materials 79% merino wool, 19% nylon, 2% lycra® Spandex