Stay comfy out on the slopes this season with these Smartwool PhD Ski Ultra Light 3-Pack socks. Over the calf socks. Sold as three-pair pack. 4-Degree Elite Fit System construction uses two elastics to provide better stretch and to keep your sock in place. The PhD socks are packed with technologies that are designed to keep your feet comfy so you can focus more on the trail. ReliaWool technology provides added durability in high impact areas. Mesh panels on the out step help provide added breathability. Ultra-light cushioning provides maximum performance with minimal cushioning to works well in close-fitted shoes. Virtually Seamless toe is designed for all day comfort and to minimize chaffing. 55 percent wool, 42 percent nylon, 3 percent elastane. Hand wash, line dry. Made in USA and imported.