Eliminating excess bulk with a highly tapered design and offering exceptional warmth and protection for its weight, the Rab Neutrino Pro 300 Sleeping Bag is built for fast and light spring and summer mountain missions. Filled with 800FP goose down and covered with wind and water resistant, recycled Pertex Quantum Pro, it's got everything you need for a night spent outdoors. Neutrino Pro 300 Sleeping Bag