One of our most popular styles, The Cosima down hybrid jacket offers the best of both a down and synthetic jacket, providing a warm, waterproof-breathable, durable, and versatile jacket for even the coldest of days. Featuring allied feather and down responsibly sourced 550 fill power Duck Down and Thermore Classic on the lower body and sides for a flattering fit. The Cosima down jacket is a go-anywhere winter coat for any activity on or off the mountain.