I ware a size 10 med.  I always get an 11 in running shoes because of the socks I ware with them.  So when I ordered these I assumed they would fit.  Not so, they were too narrow and my toes hit the end of the shoes.  Also, I don't like shoes I can lace up and tighten, these are slip-on with laces.  Even for the price they are not worth it.  I really need to go to an athletic store and by the correct shoes, no more on-line buying for me.