Flexfit® design for an ergonomic snug fit. Lycra® panels on the sides and shoulders for movement. Ribbed cuffs for maximum comfort. ZEPTO® heat metal fiber technology is so light and flexible, you wont even feel it. Micro bacterial and water-repellent outer shell lets air circulate through out the jacket. Wear over a long sleeve tee and under an outer jacket. Complete distribution of heat on the front, back, arms and collar. Powered by a 12V power source. Comes with a 20” battery cord. Glove connector cable at the end of each sleeve. 2 input connections to control jacket and gloves seperatly. Produces 87 watts of heat and draws 6.4 amps of current.