A cushioned merino crew with the graphic knit into the leg rather than printed on top of it - so it wears in instead of wearing off. Merino handles the temperature swing between a cold trailhead and a warm afternoon, and it&';s slow to hold odor, which is the real reason people reach for it. Full cushion underfoot, ribbed arch, reinforced heel and toe. Every product purchased removes one pound of trash from oceans and waterways. Fabric. 65% merino wool, 32% nylon, 3% spandex. Made in China. Sizing. S/M fits women&';s 5-8, men&';s 6-9. M/L fits women&';s 9-12, men&';s 10-13.