Designed to be combined with the TRILOGY BIVY overbag to compose a waterproof and very breathable kit, weighing less than a kilo, this mountaineering sleeping bag is made for mountain expeditions. It benefits from a minimalist construction providing maximum warmth where needed, with a K DRY™ FP 850+ goose down insulation, making no compromise on weight. Therefore, this ultra-light and durable ripstop nylon bag has no hood and closes thanks to a draw cord, without any zip. Developed together with the MILLET experts, mountain guides and mountaineers, this bag is the super light and functional solution to spend bivouac nights on the mountain feeling warm while not overburdening the load.