Built to work efficiently with a high performance boot, the PhD Downhill Racer Socks feature technology that provides the cushioning and breathability you need to maximize your performance on the slopes. 58% merino wool, 40% nylon, 2% elastane. 4 DegreeTM elite fit system allows for greater stretch and recovery. Patented ReliaWoolTM technology in high impact areas for added durability. Strategically placed mesh ventilation for breathability. Flat knit toe seam offers durability and prevents irritation. Light cushioning in the shin for added comfort. Non cushioned heal and tow for high performance boot fit. 14 overall height. Made in the USA.