The ultimate companion for hot summer hikes. Coolmax® moves moisture away from your skin and dries fast while legendary Darn Tough construction brings comfort, durability and fit to the trail. Features 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. COOLMAX® is engineered to move moisture away from your skin and dry fast in warm conditions. Sizing Small fits women's shoe size 4.5-7. Medium fits women's shoe size 7.5-9.5. Large fits women's shoe size 10-11.5. Material contents: 58% Coolmax Polyester, 39% Nylon, 3% Lycra Spandex. Care instructions: Machine wash warm, inside-out, on gentle cycle. Do not bleach. Tumble dry low. Do not dry clean. Lifetime guarantee. Made in Vermont, USA.