Already a big name in breathable insulation, The North Face's Ventrix series gets a breathable boost with the Ventrix Light Fleece Hybrid Jacket. Utilizing a hybrid design that combines a stretchy and breathable fleece fabric and lighter-weight Ventrix insulation throughout the body, this active insulator is a versatile layer for active cold-weather pursuits like backcountry skiing and winter hiking, and also wears well on its own during cooler shoulder-season climbing sessions. The smooth and stretchy fleece boosts breathability and mobility on the sides and under the arms, while Ventrix insulation keeps your core comfortably warm. And in case you're working up too much of a sweat on the trail or skintrack, TNF placed small perforations through the upper back for ventilation and comfort. Meanwhile, micro-elastic at the cuffs and hem provide a snug seal against cold weather, while thumbhole sleeves ensure easy layering when you through a shell on over it. You've got all that, plus a DWR (Durable Water Repellent) coating and warm-when-wet insulation to ensure that sudden snow showers don't ruin your day in the mountains.