With ultra-lightweight fabric inside and out plus space-age synthetic insulation tech, the AERO INSULATOR is the most technically advanced layering piece Strafe makes. The PrimaLoft® Gold insulation with Cross-Core™ infuses NASA-developed aerogel particles (composed of 95% air) into the fibers, providing an exceptional insulation barrier and warmth to weight ratio. This piece won’t wet out and packs up pocket-sized in your pack. Strategic pocket placements allow for easy access while wearing a pack or harness. No matter what adventure you're setting out on, don't even think about leaving the AERO INSULATOR behind.