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What Our Gearhead(R) Experts Are Saying:"This is my go-to midlayer for cold days in the backcountry. The Primaloft(R) insulation traps heat without bulk and the underarm softshell panels help regulate temperature when I'm skinning up. It's lightweight packable and breathable-everything I need for layering under a shell or rocking solo on bluebird days."For those who push limits in the mountains the Airblaster Beast Crux Insulator delivers lightweight warmth without compromise. The 100g Primaloft(R) insulation made from 100% post-consumer recycled content packs down small but offers serious heat retention making it an essential layer for everything from deep winter tours to crisp spring days. Designed for active movement this insulator features breathable softshell panels under the arms to release excess heat while maintaining water resistance. The ergonomic hood cinch adjusts with one hand while zippered hand and chest pockets provide secure storage. Crafted with 100% recycled ripstop nylon and a PFAS-free DWR coating the Beast Crux is built for performance with a sustainability-first mindset. Whether layering under a shell or wearing it as a standalone this jacket is made for adventure.