There is a shape difference in shoes. Men's shoes are like boxes, very little difference in width between the toes and heels. Women's show have more of a pear shape, wider at the front and narrower at the heel. For me it means in men's I am a 9-9.5 EEE just to get my toes in, but then I have 1/2 inch on both sides of my heel and at the toes, 'clown shoes'. Lead to numerous ankle and knee issues (operations ad sprains). In women's I'm a regular size 10 and size 11 in some narrower heels. I can't get my feet into pumps, but that's alright, there is plenty of others I can.