Apex MC-X All Mountain Walkable Double Boa Ski Boots. Has some wear on the bottoms. One of the tongue pulls is pulled out on one side. The boot outer soles are in Great shape. Some scuffs and marks on the buckles from use. Please see all of the pics for more details and inclusions. The Apex MC-X is a high-performance all-mountain ski boot system approx. 101mm last, 100-120 adjustable flex, and a walkable inner boot with a dual-zone Boa closure system. It utilizes an Open-ChassisT design with Vibram Ice Tech soles for, comfort, warmth, and precision, often recommended for those seeking a, customizable fit. Adjustable 100 / 110 / 120 approx. 101mm (sometimes cited as 103mm or 105mm in different iterations). Dual-zone Boa® (side reel for instep, front for shin). Open-ChassisT with 3-point docking system. High-traction walkable inner boot. Key Features and Performance. Separates the rigid outer chassis (for power transfer) from the soft, walkable inner boot. Features adjustable flex, cuff alignment, and forward lean. Designed to provide a secure, comfortable fit for all-day use. All-mountain skiers looking for a blend of performance and comfort, including those who hike on ridges.