At Winterboots.com, we take our winter socks seriously. That's the reason we carry Darn Tough's durable winter socks. The ultra high density knitting reduces bulk, won't break down under pressure and has a nice deep heel pocket reduces friction - which means no blisters! 25 years of making socks means nothing but the best product for you. Darn Tough takes quality and craftsmanship darn seriously! We also can't help but love that they're made right here in the US, in our very wintry home state of Vermont. Trust us, Vermonters know a thing or two about staying warm!