When we built the industry-first Adrenaline GTXA(R) Boot, it set the standard for technical snowmobile footwear. For the Adrenaline&';s 3rd generation, perfecting and improving upon a near-perfect formula was our goal. Adrenaline provides a dry, comfortable, and supportive riding experience across a wide range of conditions without impeding freedom of movement. GUARANTEED TO KEEP YOU DRYA(R) GORE-TEXA(R) TECHNOLOGY 600 GRAMS OF 3M(TM) THINSULATE(TM) INSULATION INSULATION INSIDE GORE-TEXA(R) MEMBRANE ENSURING A DRY THERMAL LAYER EXTREMELY DURABLE/AGGRESSIVE SOLE MOISTURE-WICKING LINER PLUSH LINER MATERIALS SPEED LACE SYSTEM COMFORTABLE YET STIFF/DURABLE SOLE INTERNAL CUSHIONING LOWER ""D"" RING POSITION TO HOLD CUFF DOWN REMOVABLE MOISTURE-WICKING ORTHOLITEA(R) INSOLE ANKLE CUTOUT PROMOTES FORWARD FLEX USE OF A TECHNICAL SOCK IS REQUIRED TO ENSURE GORE-TEXA(R) FOOTWEAR TOP PERFORMANCE REPLACEMENT LACES AVAILABLE HALF SIZE FIT CREATED WITH INCLUDED INSOLE INSERT