Nylon reinforced toe and heel. Core spun Merino and Meryl skinlife construction. High rise 7 Inch cuff. Feel warmer when the weather gets cool so you can ride harder in comfort with the HRc+ Merino sock, the ultimate sock for training and racing. The compressive qualities promote increased circulation with greater arch support, and the extra reinforced toe and heel improve durability. With a 7-inch cuff height, you have protection on the trail and warmth when the weather gets cool. Material Composition: 30% Merino Wool, 30% Polyamide, 35% Elastane, 5% Polypropylene.