Strafe Women's Aero InsulatorWith 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