Youth BOA™ Fit System Articulating Cuff Upper Comfort Foam EVA Liner Die-Cut EVA Grows-ALong Shims Low Pro Outsole Comfortable, convenient, and full of next-level features, the K2 YOU+H boot was engineered with the grom’s (and parent’s) best interest in mind. With features including an easy-to-use Youth BOA® Fit System and our adjustable Grows-A-Long™ shims to adapt to the never-ending growth of young snowboarders. K2 Snowboarding Youth Snowboard Boot