The versatile Marmot Yolla Bolly 15 Sleeping Bag is both a quilt and a sleeping bag thanks to a wrap-around zipper that opens completely up for maximum comfort for any type of sleeper. Throw your arms out and button the bag closed at the top, open it all the way up on warmer nights, or bundle up snug beneath the lofty 650-fill down insulation and let the gentle interior hood fabric send you to dream town, where snow is made of cotton candy and the trees all have bark made of chocolate.