The Magus Men's Rain Jacket features Marmot's Stretch NanoPro technologyâa porous coating that provides enhanced waterproofing and breathability while retaining full range of motion during high activity. The Magus also features fully taped seams to prevent leaks, water-resistant zippers, and an attached hood with peripheral drawcord adjustment for complete coverage. If interior heat should begin to build up, simply open the PitZipsâzippered ventilation openings under the armsâto increase air flow. Your arms will retain full mobility through it all, thanks to the built-in Angel-Wing Movement.