The Adrenaline Pro S GTX BOAA(R) Boot is a mountain-focused boot for the most aggressive riders. Featuring a new custom-developed MichelinA(R) sole for grip and durability, the Adrenaline Pro S GTX BOAA(R) Boot is the most popular boot in snowmobiling and now more supportive. Stronger BOAA(R) 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(TM) GORE-TEX protects insulation from water 3M(TM) Thinsulate(TM) insulation - 600G Leather upper w/ reinforced rubber toe & heel MichelinA(R) rubber outsole for grip & durability BOAA(R) dual-zone lacing system for fast precision fit BOAA(R) H4 coiler system & durable SS2 lace BOAA(R) dial & lace warranty guarantee Breakaway dial failsafe prevents breakage Open lacing system sheds ice and debris Molded tongue and sequence lacing distributes closure force evenly Durable midsole with walking comfort Removable moisture wicking OrtholiteA(R) insole Breathable, moisture-wicking liner Half-size insert for adjustable fit D-ring for pant leg retention Entry assist heel loop Women&';s sizing: size down 2 from men&';s