Performance Fit: No slipping, no bunching, and no blisters. Fine Gauge Knitting: Unprecedented durability and our unique "put it on, forget it&&';;s on" feel. Fast Action Wicking: Pulls moisture away from skin. Fast drying. All Weather Performance: Cool in the summer, warm in the winter. Guaranteed For Life: No strings. No conditions. For life. Merino Wool is fast drying, breathable and odor resistant for all-day comfort. Sustainability - From responsible sourcing practices to livable wages in our communities - Darn Tough Vermont is committed to progressive, positive, growth. Our Unconditional Lifetime Guarantee supports a product we believe will last a lifetime, and very few are needed since they can be worn consecutively due to their lasting comfort, durability and fit.