These boots fit like a slipper right out of the box. I liked that the sizing was exactly the same as my shoes. These boots are great because they have a system that when you tighten the laces, it pulls the tongue of the boot back into your shin, helping to eliminate the gap that can limit response on toe side turns. The flex is not too stiff but not soft, which is great because I ride all over the mountain. I also love that the bottom of the liner does not have a footbed, so it molds around the bottom of your foot. I have a high arch, and it filled in the area, and I do not have any pain after riding for several hours like I used to with other boots.