The Monarch is Your Camping Cocoon

Like the butterfly of the same name, the Monarch has wings. This unique 3-season sleeping bag from Ust is designed to allow for an unprecedented temperature comfort range. Simply fold the wings forward over yourself for a 17°F bag, or fold them behind (or remove quickly) for a 37°F bag. The wings are also detachable and pack right into the stuff sack with the bag itself.