hello ; I recvd my pair of Keens just before leave for New Zealand and have a day of wear they , love the feel and how tough they feel . I wear they on the brutal 22 hour flight and the odor core on they definately work . we go on a pretty easy trek on Mt. Pirongia for about a hour , when we get back I notice that the back of the heel be come apart , bummer . . so I be not a happy camper ! we just get back last week and I have just send they back to Mt. Gear and hope to get a exchange . I be just hope that it be a defect . I meet a lot of people in NZ who have Keen 's and have not have any problem , so I be count the day to get a replacement . overall great Sandal ... but do ' t last very long less than 2 week .