These sandals are TERRIBLE!!! My son has worn other KEEN shoes without issue -- has actually LOVED them -- but this rubber material instead of the cloth/mesh straps on many of their sandals is just awful. It rubs, causes blisters, and is almost 'sticky'. Like, if they're worn in water, it's like sand/dirt sticks to the rubber, causing even more friction/pain when trying to walk in them wet. While I'd recommend the KEEN brand, I'd never recommend or buy this particular product again. (KEEN sandals are GREAT -- but seek out the cloth/fabric/mesh straps)