My review is based strictly on personal preference. At the top of the hill I tightened all 4 straps as tightly as I could. I made sure the high back was forward and tight. Even after doing this multiple times, I could feel my boot slipping mid run. Wasn't a huge amount, but I noticed it every time. I'm using Flow 11 boots and a large binding. In terms of fit, there shouldn't be any closer to a tight fit than branded boots/bindings. I still think Flow is a great company, I just think I made a mistake by going with a lower tier binding.