these run big
I wear a size 12 1/2 and the 12 D fits very comfortablty.
I will say they are vey comfortable, but they are flimsy. The mesh is very durable (though it attrats dust and dirt) but the structrural pieces(over the mesh toe)cracked after about 6 months. This is OK if you can afford to replace your sneakers that often, but the shoes still have plenty of good tread.