Did we get your attention with the words “heated jacket”? Because the 509 Syn Down Ignite Heated Jacket gets its warmth from low profile heating elements that offer three levels of heat—low, medium, and high—as well as 200 grams of synthetic down to create the ultimate jacket for the coldest days on the hill (or unplanned overnights). Purchase the separate 509 12 Volt Ignite Battery to take this already-warm jacket to the next level.