ScentLok introduced "on-demand warmth" to the BE:1 line with the original Reactor Heated Vest, and now we've taken things up a notch. The BE:1 Reactor Puffy Heated Vest adds two more heating pads for even more warmth while a change to Sorona(R) Aura insulation adds breathability and retains warmth with less filling and weight, making it 20% lighter than the original, less bulky, and an even better option for quick warmth in your toolkit.