This Proton vest from Arc’teryx is designed to balance air flow and keep your core warm. Crafted from Fortius™ Air 20 fabric, it’s also filled with Octa® Loft knit insulation to keep you protected in harsh conditions. It’s then complete with three convenient zip pockets at the front and signed off with a signature logo printed at the chest. 84% Nylon, 16% Lasthane Fortius™ Air 20 Octa® Loft knit insulation Zip Closure 2 Side Pockets Chest Pocket