Great shoe! As a long-time Muira Lace-up fan, I was looking for a slightly more aggressive shoe for steep! climbs. These are perfect. Plus they are well constructed, have a great fit due to the three velco strips and shoe last conforms nicely to my foot. I found that the sizing is exactly the same as both the W. Katana or the W Lace-up Muira. I don't think they stretched much, but I wear a 35 so not a lot of shoe leather to stretch to begin with.