A fusion of NASA-developed Aerogel – the world's lightest material – with PrimaLoft Gold Insulation makes this our lightest synthetic jacket ever, with the best warmth-to-weight ratio out there. Slightly Fitted. Best with midweight layer. Falls below hip. Features NASA-developed Aerogel technology for even more warmth without weight. Wind- and water-resistant construction keeps you protected from the elements. Packed with ultralight, ultrawarm 60-gram PrimaLoft® Gold insulation with Cross Core™
