The Pipedream sleeping bags were designed with alpinists, adventure racers and long distance trekkers in mind. People who don't mind sacrificing a little bit for big savings in weight and volume. There is no getting away from it, the Pipedream is a trim fit. The body and hood construction use the minimum amout of fabric to help keep the weight down. This is then packed with high quality 750+ fill power Chinese White Goose Down.