The Adrenaline Pro S GTX BOA® Boot is a mountain-focused boot for the most aggressive riders. Featuring a new custom-developed Michelin® sole for grip and durability, the Adrenaline Pro S GTX BOA® Boot is the most popular boot in snowmobiling and now more supportive. Stronger BOA? dials combine with a molded tongue for improved closure force and lace force distribution, creating added support and comfort on the running boards. Gore-Tex - Guaranteed To Keep You Dry™. Gore-Tex protects insulation from water. 3M™ Thinsulate™ insulation - 600 grams. Leather upper with reinforced rubber toe and heel. Michelin® rubber outsole for grip and durability. BOA® dual-zone lacing system for fast precision fit. BOA® H4 coiler system and durable SS2 lace. BOA® dial and lace warranty guarantee. Breakaway dial failsafe prevents breakage.