The perfect fitting Flow snowboard boot is crucial so you can ride more comfortable and stay longer on the slope. Flow has spent the over a decade perfecting the fit and feel of the Flow Snowboard Boots. When you stay in your boots for a few hours, it is important that you have a great fit, but also temperature and moisture control. On the New Flow boots there is a thermal insulating barrier between the outsole and liner called SpaceBlanket, to keep the warth inside and the cold outside. Most Flow Snowboard Boots features the BOA closeure system that is super easy to use.