Because I'm such a klutz, and because it's so hot, I finally broke down and purchased a pair of these Keens slip-on flops.
I'd previously a pair Keen sandals that had a strap around the back heel, but they stayed on too darn well - if a rock or other detritus got into the sandal bed, there was no getting it out without taking off the whole sandal. They were also flippin' HOT on my feet. These new ones, however, don't have those problems. The toe guards keep my tootsies from banging into rocks or tripping over roots. The soles are thick and can take walking around on our rocky terrain or the cement floor. The strap underliners are soft and comfortable. Easy to slip on & off, too. Most important of all: they're washable. I clean these bad boys off with a high-pressure stream of water from the hose almost every morning, and the flops handling the abuse like a champ.
I'll close by saying "no, I don't work for or otherwise get paid by Keen". I like these shoes. Hope they last a good long time.