Sitka designed the Ambient Jacket to be durable, packable, and most of all, adaptable to changing weather conditions and levels of activity. Utilizing low-bulk PrimaLoft Evolve active insulation, this jacket delivers plenty of warmth when you're still, breathes well and manages moisture when you're moving and dries quickly if it gets wet. Ideal under a shell during cold weather hunts, on its own during brisk spring and fall evenings in camp, or tossed into your pack for summertime backpacking trips into the high country, there's never a time when you don't need this.