They are crap! I ordered a 1and the packaging said 12 but they seemed big bit still usable so I took them on a camping trip.Once I got them wet  they were enough to Large to let rocks in so I inspected them more closely and they were actually size 13. Before my 4 day trip was over they were separating from the soles and the mesh wash torn in several places. I would not purchase these again or recommend them to anyone.