The buckle is nice you can easily sinch them down for when you need it and loosen for comfort. Im never buying one of these controllers again from this company! EUR was probably the European size designation of the shoe size chart. I bought this late November, the problem started mid February. They have great arch support, good traction, and they fit snug on my feet. Very happy with these shoes. Wipes clean easy. I no longer have to find something to lean my bike against at home or when Im out and about. I like that it’s so narrow that it fits behind the door. I’m a big person and it’s hard for me to find flip flops that don’t hurt my feet or back.