I wear a size 13M shoe so I ordered the XL size socks.  I've machine washed then air dried them at least four times and these socks have retained their size and shape quite well.  I haven't noticed any unusual wear, shrinkage, or picks in either pair.  I have neuropathy and I've found that these socks help to ease the burning and prickling symptoms that accompany that disorder.  I recommend the
Wigwam Men's At Work Double Duty 2-Pack Socks whole-heartedly.