For the harshest conditions and the best days on the mountain Lenz active warmth systems generate heat so your body requires significantly less energy to keep you comfortable. No more freezy fingers and unhappy toes, this Lenz Lithium Pack rcB 2000 is here to give you programmable warmth in cold conditions. Staying comfortable out there increases your efficiency, makes lift time a whole lot more pleasant, and reduces the risk of injury as you can concentrate on what lies ahead…not on your fingers, toes, and core. Stay warm, stay out, have fun with a rechargeable battery pack built to keep you comfortable out there.