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. Updated this season to be even warmer with horizontal baffling for more loft and slightly higher insulation weight. 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.