Socks always wear out in the heel, sometimes the toe, but usually the heel. And the worn through heel...makes a good hole for your thumb, if you cut off most of the foot part and use the rest for a mitt, the cuff for armwarmers. I can't wear most fingerless gloves anymore, my hands object to any sort of binding, even soft gloves or socks, but they love the snuggly warmth of soft sock cuffs. The heel-hole for my thumb, though, can't do that either, it pulls and stresses the joint. So I'm wearing a snazzy, cozy pair of sock cuffs over my achey wrist bones, pulled up to the base of my fingers, and the joints are all loose and warm and happy.
I just need to remember to snatch them off before washing my hands, or plunging them into dishwater.