The lightest waterproof down jacket we've ever built. Provides complete weather protection in ounces. Revolutionary new fabric replaces traditional, high-loft down clusters with ultrathin down sheets, eliminating the need for quilting or channels. It also creates maximum thermal efficiency without bulk and, since the down is uniform throughout, there are no cold spots. You get all warmth, no puff, in a simple, streamlined design that delivers superior technical performance.