I purchased a pair of these size 10.5 because they are designed with a full heel, which I feel is essential for me. The first pair had a funny-feeling bump in the footbed of the left-hand
sandals, so I ordered a second pair to compare, figuring it wouldn't have the same issue. The second pair came an had the exact same issue. These were the only water
sandals I could find this year with a full heal. So I went ahead and started wearing them, figuring the awkward bump would go away as they were worn in. I've been wearing them for about two weeks now and I have to say my left foot is in misery. The more I wear them, observe them and think about them -- which I do all day because they are so uncomfortable -- the more I can see that these are simply defective, with the whole arch and footbed structure in the left
sandal completely wrong. You can see the difference when compared with the right
sandals footbed and arch structure. I'm thinking that
Keen has a manufacturing problem with these shoes, and I am very bummed out. I owned a pair of very similar
Keen's for the last couple of years and loved them. I hope this company figures this out. Meantime, If they don't feel right to you, don't make the same mistake as me and think they will break in after a bit.