The primary materials that compose this product contain a minimum of 20 percent recycled content. When you need that little extra comfort and warmth on your adventurous outdoor trips, reach for the Smartwool Run Zero Cushion Ankle Socks. Sold as a one-pair pack. The PhD socks are packed with technologies that are designed to keep your feet comfy so you can focus more on the trail. Ultra-light cushioning provides maximum performance with minimal cushioning to work well in close-fitted shoes. 4-Degree Elite Fit System construction uses two elastics to provide better stretch and to keep your sock in place. Indestructawool is engineered to provide maximum comfort and durability. Shred Shield reduces wear and tear on the toes for added durability. Achilles strap helps give you added protection and warmth. Mesh panels on the out step help provide added breathability. Merino fibers provide outstanding softness and construction. Sits at the ankle length. 46% Merino wool, 26% nylon, 25% recycled nylon, 3% elastane. M