For every great pair of Doc’s, there’s usually a great pair of socks behind it. That’s why we created some to help you break in a pair of Doc’s with ease. The Double Doc Sock features extra padding in all the classic friction points, like at the back of the heel and also the ankle. Thry also now come with arch support and a new blister protection system in the lining. They are machine washable and are made with 84% cotton, 15% poly-amide and 1% elastane.