When we built the industry-first Adrenaline GTX Boot, it set the standard for technical snowmobile footwear. Improving and tweaking the Adrenaline BOA near-perfect formula was our goal. The Adrenaline provides a dry, comfortable, and supportive riding experience across a wide range of conditions without impeding freedom of movement. Gore-Tex Technology - Guaranteed To Keep You Dry 600 Grams Of 3M Thinsulate Insulation Insulation Inside Gore-Tex Membrane Ensuring A Dry Thermal Layer Extremely Durable/Aggressive Sole Plush Moisture-Wicking Liner Materials Comfortable Yet Stiff/Durable Sole Internal Cushioning Boa Dual-Zone Lacing System Lower "D" Ring Position To Hold Cuff Down Removable Moisture-Wicking Ortholite Insole Ankle Cutout Promotes Forward Flex Use Of A Technical Sock Is Required To Ensure Gore-Tex Footwear Top Performance Half Size Fit Created With Included Insole Insert Read more