The all-new Adrenaline Pro S GTX Boot is a LACE-UP mountain-focused boot for the most aggressive riders. Featuring a custom-developed Michelin sole for grip and durability, the Adrenaline Pro S GTX Boot is the most popular boot in snowmobiling and now even more supportive. Strong standard lacing combines with a molded tongue for improved closure force distribution, creating added support and comfort on the running boards.