30K Eco Vortex protection with ultralight, packable Primaloft insulation. The Beast 2L is sleek and stormproof, with just a touch of Primaloft insulation to stomp out drafts and keep you toasty when the winter wind starts whipping. Like having an invisible lightweight mid layer built seamlessly and efficiently into your shell, you can now simplify your kit while staying dry, warm, and ready for action. Did we mention the Green Critterflage?