Description: Alps Mountaineering Cedar Ridge Cobalt Springs +25° Md: 4921602 The Cobalt Springs is a great choice for any family camping trip. The outer is a durable 190T Polyester that looks as good as it feels. The 100% cotton flannel lining provides an extra soft feel when you are sleeping under the stars in the wilderness or the backyard. The insulation is a hollow-fiber that gives you great loft and warmth at the same time. The zipper allows you to zip multiple bags together. A standard stuff sack is included.