Bren SL Store Water Sports Swimming Dive Socks Neoprene Diving Swimming Fin Boot Socks

I can't remember if these come in different sizes. If they do I would have gone for L or XL, but there is no size marking on the ones I have got. But whatever size they are, they are very stretchy and are perfectly comfortable and a very good fit on my size 12 feet... and I think they would accommodate bigger. As other people have pointed out in their reviews, these socks are not made of neoprene but some kind of stretchy polyester (I think). They won't keep your feet warm or particularly protected when walking on the shore but they are brilliant for making it much easier to get wet wetsuits on and off; and also for reducing chafing if you are wearing full foot fins on bare feet for an extended period (e.g. multi-day dive/snorkel trip in warm waters).