I'm no sandal expert, so I'll just post some observations.  I'm a size 10 and got the "coffee" size 10 sandals which look appealing; these are not easy to slip on, but the snug fit is reassuring if you don't mind the slight pressure between your toes.  your foot is further back on the bed than I'm used to, so the extra toe front may offer a bit of protection, while your back foot is right at the edge of the bed - I would have preferred to be a centimeter or two more forward, so I wonder if I should have bought a size 11.  the dimpled bed may be better at displacing water along the way, but wet sand may cake up under your feet until it's dry enough to flake off.  I'd add a star if these sandals survive a few seasons intact, but since it's all glued not also stitched together, my confidence is not high.