The HRc+ Merino Wool sock has become Giro’s most-loved sock for riders who demand performance. It is now available with a core spun Meryl Merino wool yarn that adds the soft touch of wool for mountain biking and some warmth for cool-weather riding. The compressive qualities of the HRc+ Merino wool sock 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.