BEST-IN-CLASS WOOL SOCKS BUILT FOR TIME AND DISTANCE We put our feet through hell, so our socks must meet the highest standards-no blisters, no friction where the sock meets the shoe. The Merino Wool Challenge Sock - Crew was built to tackle anything from rucking miles across the rainforest to sandbag workouts in your driveway, these socks won&';t wear thin or lose shape. They&';ll keep your feet dry and, even after days of use, they don&';t stink. Ultimately, they work well with any shoe but were designed to counter friction from the heel cup over time and distance when wearing boots. They&';re unconditionally backed by our Scars Lifetime Guarantee and proudly made in the USA. Socks are final sale and not eligible for returns or exchanges.