The sock that made a name for itself from the Pacific Crest Trail to the AT. "Must pack" durability meets undeniable comfort in a Full Cushion sock that absorbs the rigors of the trail. 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. SPECS Boot socks sit mid-calf for added protection and warmth. A sturdy companion. 66% Merino Wool 32% Nylon 2% Lycra® Spandex Additional warmth and protection are the signature characteristics of midweight yarns in the Hike/Trek category. CUSHIONING DETAILS FULL CUSHION The Hike/Trek full cushion socks feature terry loops throughout the entire sock for the ultimate rebound and comfort. SIZE CHART SOCK SIZE SHOE SIZE Men's/Unisex Men's US Women's US EU UK XS 2.5 - 5 4.5 - 7 35 - 37.5 2.5 - 4.5 S 5.5 - 7.5 7.5 - 9.5 38 - 40.5 5 - 7 M 8 - 9.5 10 - 11.5 41 - 42.5 7.5 - 9 L 10 - 12 12 - 14 43 - 45.5 9.5 - 11.5 XL 12.5 - 14.5 — 46 - 49.5 12 - 14 XXL 15 - 17 — 50 - 53 15 - 16