UPDATE: bought 2nd pair (love the breathe-ability). If you normally wear a size 11 (women) buy a 12! Fits perfect. Don't forget some shoe inserts, love them.  I usually wear a women's 11 comfortably (with a little room so my toes don't constantly hit). My toes are touching the very end on these. I would prefer to buy a half size bigger next time. The arch support is for medium arches, you might want to buy an insert if you have high arches. Other than that, these shoes are awesome! Love that they have the leather upper toe (work requirement), but, mesh on the sides for my foot to breathe. As a delivery driver, I spend over 10 hours/day in these shoes, and they are very comfortable. Will definitely buy these again.