I ordered these in US size 9 based off Rollerblade's RB sizing guide. My foot measurements are 25.25 cm, medium width. These are a perfect fit - they feel snug, not too cramped anywhere and with a tiny bit of toe wiggle room even before tightening the laces and straps.I started skating on a cheaper amazon brand a few months ago just to learn how to move on triskates. 5 months later I felt I was ready to try some brand name skates good for beginners so I thought these RB110s would be good. I've put in a few hours so far and I'm very pleased with the fit, feel and performance. I replaced the stock Supreme wheels with Hydrogen 110s and stock bearings with IW ceramic bearings. Needless to say they are very stable and maneuverable. The boot lining is a bit stiff and needs to be broken in with more skate sessions. Overall I'm happy and can see myself riding in these for several months to a few years before I consider upgrading again.