No quilting. No cold spots. This is down. Revolutionary new Thindown® 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.
NOTE: Temperature ratings are based on a controlled laboratory test, using low and moderate activity levels. Also consider: your sensitivity to cold and wind-chill; time of exposure; activity level; and use of layering.