Mountain Hardwear Dynotherm Down Jacket - Men'sLightweight, versatile, and packable, with a high warmth to weight ratio. The Dynotherm Down Jacket is made for cold, active afternoons outside with friends, and can handle even colder evenings around the campfire. Its fortified with Q. Shield DOWN 650 fill insulation, which retains critical loft and warmth even when wet, so you stay balmy without the bulk.