The Heavyweight is your go-to work sock for steel toe boots and cold weather.  With heavy wool padding on the toe, heel, and through the calf, these socks offer all-day comfort and a hefty layer of protection for your feet.  Ironside Durability Made with 53% Ironside Merino wool that puts regular socks to shame. We’re so confident in our socks, we offer our Decade Guarantee. Work in your socks for 10 years and if they get holes, send ‘em back and we’ll replace ‘em.  Thermoregulation High density knit Merino wool helps keep your feet warm in winter and cool in the summer. If you’ve ever worn a steel toe boot in winter, you know how cold your toes can get.  Our heavyweight boot sock is perfect if you like having feeling in your toes. But unlike cotton socks, the Merino wool wicks moisture away from your feet so they stay dry and comfortable. All Day Comfort The natural fiber in our socks vents sweat and moisture away from your foot, which not only keeps you more comfortable, but prevents blisters and reduces odor.  Plus, the high density knit we use allows for padding around the heel, ball, and instep of your foot, so even the toughest boots feel comfortable. Compression and Support We weave Spandex and nylon into our fabric to create light compression around the arch of your foot. The compression helps circulation, which helps your recovery time so your feet still feel fresh the day after putting in 14 hours on the job site.  USA Made Our socks are made in North Carolina with US wool. Even our sheep are American, baby.