What Our Gearhead(R) Experts Are Saying:"I tested the WarmCube Active Novus Zip Jacket on a cold morning hike where the temperature and my effort level kept shifting, and it handled both without making me reach for the zipper every five minutes. The WarmCube insulation genuinely breathes when you are moving and locks heat in the moment you stop, which is exactly what a jacket at this price point should do."The trailhead is dark and cold, the pack is light, and the plan is to move fast enough to earn the view before the crowds arrive. A puffy that traps heat on the uphills is the last thing that plan needs, and the Marmot WarmCube Active Novus Zip Jacket understands that better than most. WarmCube Active insulation circulates air through the jacket while you are in motion, then snaps into heat-trapping mode the moment you slow down, so the temperature inside the jacket stays comfortable no matter what the trail demands. At just 15oz, it sits close and moves freely without the marshmallow bulk of traditional puffies. Thermal R synthetic fill and 3M Thinsulate Featherless insulation keep warmth intact even when conditions turn damp, and the recycled ripstop nylon shell handles daily use without showing it. Gusseted underarms open up the range of motion for big steps and pole plants, and the adjustable hem drawcord seals things out when the wind picks up. Wear it alone on active days or pull a shell over it when the weather gets serious.