Vest First Light Hybrid A highly versatile, insulating midlayer combining the benefits of our First Light insulation with mapped merino wool in key areas to maximize breathability, the First Light 1.0 Stretch Vest insulates, breathes and moves with you through pre-dawn starts, headlamp descents and everything in between. This dynamic layer features migration-resistant PrimaLoft® Gold Active Insulation in the chest and arms, with a blended merino wool backing for increased breathability and range of motion. Its lightweight, 20D stretch nylon ripstop shell has a PFC-free DWR coating that resists unexpected weather. The vest also has a zippered chest pocket to store small essentials.