I find, unlike so many other shoe companies, these run true to size. If you like these, then I suggest you also look at the Aqua X Sports. They are what I wear the other 15% of the time, and are great lightweight trail runners that are not bothered by water/rain or mud. I've removed the insoles from mine to make them even lighter, and they are amazing for running/walking through rough and slippery terrain (trails through tropical rainforests with plenty of mud, rocks, and significant inclines/declines). [The default color of light blue look like clown shoes to me, but the others are much more tame... I own the black ones and get away with using them in business-casual situations if I use black socks with them... without socks they are great as aqua-shoes for shallow water with jagged rocks].