One of the lightest synthetic insulated jackets on the market, the new Ultralight Aero Insulator uses space-age Primaloft® Gold Insulation with Cross Core™ and our new lightweight 100% recycled 10D nylon fabric for an impressive warmth-to-weight ratio without sacrificing features or durability. Removing the exterior quilted channels increases loft and traps warm air, providing thermal and weather protection when you need it most. This is our new go-to insulator style for light and fast missions.