Airflow provides the perfect mix of flexibility, breathability, and protection from the elements. On top of it all, it feels practically weightless, making it ideal for just about any weather that has you reaching for an extra layer. 3DeFX+insulation offers a revolutionary amount of warmth, with a minimal amount of material by creating air pockets that recycle your body’s heat. The Airflow InsulatedJacket gives you way more stretch, comfort, and breathability than your old puffer, while remaining almost weightless.