Another great feature is the Primaloft® Thermoplumes, that run sort of like tubes halfway across the back. They open up slightly at the bottom, where you can see a perforated membrane. This allows moisture to flow out, while the warmer air your body produces stays in. It’s a refined, lightweight combination of insulation that uses a unique design to balance heat retention and breathability.
Back in the day I would always layer up with a normal base layer, then add a thicker, fleece-style layer under a shell jacket. Whenever I hiked, I would have to get the fleece off. It wouldn’t breathe, and I was sweating like a pig. With the Primaloft® technology, I felt like I could hike while keeping my jacket on, and not be bathed in sweat at the top. Airflow was provided from the minute I started walking. The same goes for hikes.
The jacket is waterproof to a certain point, but it’s definitely not a rain jacket. I wouldn’t recommend using it on a rainy day without adding a waterproof layer on top.