The new Haven^TMTop Bag provides ultimate synergy between mattress and bag. It´s unique, zipperless design takes advantage of inherent mattress warmth, eliminating insulation between pad and sleeper. The Haven Top Bag combines premium 700-fill down with a full hood, foot box and wrap-around coverage while utilizing inherent mattress warmth to achieve an EN-13537 rating of -6° at a mere 624g.