Mountains are like socks: from afar they might seem similar, but in the thick of it you find out just what they're made of. Beneath the Liftline's design is a climate-controlling, high-performance, lightweight Merino Wool sock, with a fit that offers superior connectivity, peak after peak. Sock Size Men US Women US* Euro UK Extra Small 2.5–5 4.5–7 35–38 2.5–4.5 S 5.5–7.5 7.5–9.5 38–40 5–7 M 8–9.5 10–11.5 41–42 7.5–9 L 10–12 12–14 43–45 9.5–11.5 Extra Large 12.5–14.5 — 46–49 12–14 Extra Extra Large 15–17 — 50–53 15–16 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: The ultimate fiber for breathability and comfort in all conditions. True Seamless™: Undetectable seam fusion for an ultra smooth, invisible feel. SPECS Light: Built light, darn comfy and super strong—substantial construction for a lightweight, sure fit. Over the Calf Height: The name says it all. The ultimate height for keeping the outside—out. 52% Merino Wool 45% Nylon 3% Lycra® Spandex