The PreCip Women's Rain Jacket features Marmot's comfortable and breathable NanoPro waterproofing technology. NanoPro coating is comprised of densely packed pores small enough to keep water droplets from getting in, but big enough to let water vapor out â€œproviding cool, dry comfort even as your activity level increases. The PreCip also features fully taped seams to prevent leaks, an attached hood that rolls up when not in use, and a DriClime chin guard that protects against scratching when the jacket is fully zipped. If interior heat should begin to build up, simply open the PitZips â€œzippered ventilation openings under the arms â€œto increase air flow. Your arms will retain full mobility through it all, thanks to the built-in Angel-Wing Movement. When the weather lets up, you can stuff the entire jacket into its interior pocket and stash it in your pack.