Ok so ive noticed that many people think that the .0 and .5 sizes on boots are a difference in length. it really isnt. if you look they both have the same shell but slightly different liners. like the .5 sizes are going to be wider but hardly if any longer. so if u have a wider foot that is sized to a .0 size then just go with a .5 and itll be a little more comfy and vise versa narrow foot sized to a .5 go with the .0 and you wont experience as much slippage