Staying warm in frigid winter conditions is always a challenge, with icy winds and sub-freezing temperatures threatening to steal your precious body heat. Making your alpine climbing and ski touring experience more enjoyable, the Marmot Men's Tullus Down Jacket brings you 600-fill down insulation within an easy-packing design. The polyester ripstop shell retains lightweight efficiency, with a DWR treatment for moisture-shedding protection from light rain and snow showers. Marmot's Down Defender prevents damp, moisture-laden air and oncoming precipitation from compromising the down's heat-trapping abilities. In fact, Marmot claims this treatment allows down to remain dry for ten times longer and maintain 150 percent more loft than untreated down.