The signature component of the Apex Ski Boot System. The Open-Chassis™ is a unique design that offers customizable flex that is independent of fit, along with superior stability and precise edge control. Snowboard boots have always featured a soft exterior and comfort that no ski boot could offer. Snowboarders could perform all day on the mountain, and then walk around at the end of the day in the same boots and never worry about loosening them up. The Apex Walkable Support Boot provides the comfort and warmth of a snowboard boot that you can ski in all day long. Apex design incorporates the game-changing Boa® reel and stainless steel cable lacing system to provide precise control by locking your foot firmly into the heel pocket.