This synthetic down insulation is one of the highest quality available in the market. It's synthetic construction gives it many advantages over traditional, naturally-sourced down products. Quick drying and completely hypoallergenic, the fibers of this material are also moisture resistant, allowing them to maintain excellent loft and warmth in wet conditions. EcoDown is also extremely lightweight, and has a great warmth-to-weight ratio. The result is a jacket that weighs less than you might expect, but easily keeps you as warm, if not more so, than other, more bulky garments.