I agree with those stating  the piece that goes between the toes is sharp.  I got these just for showering at the fitness center and even in that short period of time being in the shower they left my toes red and in slight pain.  For what I got them for they are perfect, minus the toe issue.  They dry fast and provide stable traction on wet floors.  I wouldn't get these to wear on the beach our four long periods of time.  Also I wear a 9.5 shoe and got these in size 8 and they fit perfect.