For the most part, ski boots have been relatively unchanged for a long time in terms of a liner in shell format. The new BOA closure system that we’re seeing come through is one of the more important aspects of boot design in recent history. Replacing the lower two buckles with a dial and a cable makes a lot of sense when we’re thinking about wrapping the foot with the lower shell. While buckles simply clamp down on the foot, the BOA closure system closes the bottom of the boot evenly. You can fine-tune the tightness with the simple twist of a dial, making the whole system user-friendly and engaging. Top brands like Atomic, Nordica, Tecnica, and K2 are all using the BOA closure system on many of their models, making a move to the mainstream when it comes to blending comfort and performance.