OK - if you are buying these to wear around the house or to hang out in the marina restaurant, they're probably OK. If you spend any time on boats, they are treacherous. On a fiberglass deck or wet teak, you may as well be on roller skates - no non skid properties at all.  Others have mentioned size. I wear a 10 1/2. I ordered an 11 and they are still a bit small. Looks like they run one to one and a half sizes smaller that they claim.