Totally trail ready. With these crew socks, Smartwool envisions the trek ahead, crafting them from a moisture- and odor-controlling merino blend, strengthening the construction with Indestructawool(TM) and 4-Degree(TM) Elite Fit technologies, improving ventilation, and adding impact absorption without a bulky fit. So, once you have a destination picked out, pull these on and then lace up your best hiking boots for a smoother trailhead-to-peak journey.. . 62% merino wool/36% nylon/2% elastane. Premium yarn construction. Indestructawool(TM) uses a proprietary, patent-pending yarn for improved durability and comfort. Light cushioning for impact absorption and warmth. 4-Degree(TM) Elite Fit System improves stretch and prevents socks from bunching, thanks to dual-elastic construction and flex zones. Virtually Seamless(TM) toe lessens chafing. Mesh venting improves breathability. Achilles strap for extra protection. Crew height. Machine washable. Made in USA.