We redesigned the Aurora GTX BOAA(R) boot with major durability and comfort improvements for female mountain and crossover riders facing both high speed trails and backcountry powder. Featuring waterproof construction, 800G of warm 3M(TM) Thinsulate(TM) insulation, more durable mesh and a new molded tongue, this snowmobile boot provides supportive all-day fit. The highly-durable MICHELINA(R) sole adds support and stiffness while key flex panels add walking comfort. GORE-TEX GUARANTEED TO KEEP YOU DRY(TM) GORE-TEX protects insulation from the elements 3M(TM) Thinsulate(TM) insulation - 800G MichelinA(R) rubber outsole for grip & durability BOAA(R) fit system for fast precision fit BOAA(R) H4 coiler system & durable SS2 lace BOAA(R) dial & lace warranty guarantee Molded tongue and sequence lacing distributes closure force evenly Open lacing system sheds ice and debris Durable midsole with walking comfort Removable moisture wicking OrtholiteA(R) insole Breathable, moisture-wicking liner Half-size insert for adjustable fit Reinforced rubber toe and heel D-ring for pant leg retention Entry assist heel loop