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This guide focuses on ultralight synthetic insulated jackets for hiking, backpacking, and mountaineering. We’ll break down the types of synthetic insulation available, how to judge a jacket’s warmth, what features to look for, how synthetic compares to down, and tips on care and maintenance. By understanding these factors, you can choose the best ultralight synthetic jacket to keep you …

From active sheet insulation that responds to your output to loose fill insulation that mimics the structure of down, we use a variety of types of PrimaLoft® synthetic insulation in our gear. Each one has its unique benefits, tailored to particular conditions and activities. So how do we select which one to use in each product? Discover how these PrimaLoft® insulations work to provide you wi …