Tackle the peaks in comfort with these Smartwool PhD Pro Mountaineer socks. Over-the-Calf cut. Sold as one-pair pack. Light Elite Cushioning provides targeted cushioning designed for runners at the ball and heel provides added protection in high impact areas. • 20-30 mmHg graduated compression rating. Indestructawool is engineered to provide maximum comfort and durability. 4-Degree Elite Fit System construction uses two elastics to provide better stretch and to keep your sock in place. Virtually Seamless toe is designed for all day comfort and to minimize chafing. Branding across toe. 49% wool 43% nylon 8% elastane. Machine wash tumble dry. Made in the U.S.A.