Winter camping and frigid alpine environments call for the Jack Wolfskin Men's Troposphere DF O2 Insulated Jacket. A combination of down and synthetic insulation give this jacket heavyweight, durable, and fast drying warmth that feels surprisingly light and lofty. The Texapore O2 shell protects this insulation with extreme waterproof, windproof, and highly breathable protection, and fully taped seams enhance waterproofing by preventing a single snowflake or raindrop from seeping through. The Troposphere DF O2 also features long zippered under each arm for ventilated airflow in case you get too cold. The hood adjusts in terms of size and field of vision, and there's a storm peak to keep the hood out of sight. There are internal cuffs made of fuzzy fleece, and thumbholes keep the sleeves in place. Pocket configuration includes two zippered side pockets for hands, a zippered chest pocket for maps, and an internal pocket with a media router so you can listen to music with your smartphone.