I am a 5 and sometimes 5. The build quality of these sandals is amazing. How much it fluffs up is amazing! (Update 5/19) Still going strong, tread is wearing down slightly but still has a good grip. The kick stand would not go into the preferred area of our childs bike but there was a similar spot we were able to install it on. They look great too. The system technically works well. Loved the ease of mounting the racks and has plenty of space. Update March 2021: they stopped working and now the conpany is not even responding to my emails for replacement. They also have an auto-off feature that kicks in after a period of no usage (I think 30 minutes, but, honestly, I have never timed it).