When you need a sock that works as hard as you do the Darn Tough Tactical range offers the most comfortable the most durable and best fitting sock around that also comes with a Lifetime Guarantee This Darn Tough Tactical Boot Extra Cushion Sock is designed for extreme cold weather thanks to its high merino wool content and full terry loop cushioning throughout for maximum warmth and all day comfort These Darn Tough Socks have a high-density stitch count reinforced toes and heel for increased durability and as mentioned are covered by Darn Tough s Lifetime Guarantee making them an excellent choice of sock for both work and leisure