I have wore Reef flip flops for about 10 years now, the first ones were the best, they were black on top and gum rubber on the bottom, lasted five years.  I replaced them with a Mick Fanning model with the bottle opener on the bottom, almost as good as the first pair, lasted about 3 years. A couple of problems with the bottle opener: it's gross, I would not drink where I walk (kind of like eat where you .....), second, it will scratch nice flooring and boat decks. I would not let people wear these on my boat, no gelcoat gouges please.

Update, the strap pulled out on one, no good! But, I called Reef customer service and they sent me a new pair of Mick Fannings free! Thanks Reef!