Marmot Men's Quasar Jacket, Black, X-Large by Marmot. $274.01. At under nine ounces, the ridiculously warm and lightweight Quasar is a modern marvel. Ultralightweight, DWR-treated Pertex Quantum shell fabric and the best 900-fill down available give this jacket an ubelievable warmth to weight ratio and compactibility that’s next to nothing. Stuff the coat into its own zippered chest pocket for fast and light packing.