Sure, the Kelty Dualist 35 Degree ThermaDri Sleeping Bag is a hybrid, but not in some, doesn't really do anything well, sense. Indeed, its combination of 550 fill DriDown and ThermaPro synthetic insulation actually make it lighter and more packable than a pure synthetic bag and more water resistant and durable than a traditional down bag. The water resistant down is layered inside the polyester taffeta shell, while the ThermaPro sits next to your body, providing plenty of warmth and cushioning. This combo gives the Dualist a three season worthy EN rating of 34 degrees, so you can comfortably take it on most spring, summer, and fall excursions without worrying about waking up shivering. A zippered draft tube, draft collar, and neck drawcord make sure your hard earned heat doesn't escape, while the two way no snag zipper will save you the hassle of having to perform emergency zipper surgery in the middle of a chilly night.