Adrenaline Pro GTX BOA Boot 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. FULL SPECS GUARANTEED TO KEEP YOU DRY® GORE-TEX® TECHNOLOGY BOA® DUAL-ZONE LACING SYSTEM 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 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