With Go Walk 3s, go up about 1/2 size. I wear mens 10 and had to up-size to 10 1/2. These Sketchers don't last long but that is typical with soft material soles. I like the squishy soft feel, easy on the feet all day. I wish they had a different sole pattern because little rocks get stuck in between the traction pods. Very anoying, allways picking out the little rocks, not bringing them into the house. Even with those issues these are great shoes, and pretty warm in 40 to 50 degree F weather and on concrete floors.