What Our Gearhead(R) Experts Are Saying:"This hoody has become my go-to midlayer for ski touring-it's warm but never stifling. The WarmCube design keeps the insulation in place and creates little pockets of heat that breathe super well. It's one of those rare jackets that feels just as good on the skin track as it does at the summit."The WarmCube Active Aerothermal Hooded Jacket is built for high-output mountain missions where warmth and breathability need to work together. Marmot's 3D WarmCube(R) construction traps heat in surrounding air channels for consistent insulation while maintaining airflow to prevent overheating. Inside, a hybrid of 700-fill down with Down Defender and Primaloft(R) Active Evolve insulation offers the best of both worlds: lightweight loft, moisture resistance, and breathable warmth that moves with us. Recycled polyester ripstop delivers durability with a lighter footprint, and the slim, packable design makes it an ideal layer under a shell or a standalone piece on cool, dry days.