Drink from enough streams and you’ll eventually get an explosive reaction. Look closely at this hike sock and you’ll see what we mean. However, a blown-out seam should be the least of your worries. That’s why the Number 2 is 1 when it comes long-lasting toughness and active comfort.Darn Tough Number 2 Micro Crew Midweight Features: 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. Naturally Antimicrobial: Repels bacteria and odor. Guaranteed For Life: No strings. No conditions. For life. Merino Wool is fast drying, breathable and odor resistant for all-day comfort. True Seamless™: Undetectable seam fusion for an ultra smooth, invisible feel.