For every great pair of Doc’s, there’s usually a great pair of socks behind it. That’s why Dr Martens 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 ankle — and now comes with arch support and a new blister protection system in the lining. Machine Washable. Size S/M: 3-7.5 M/L: 8-13.