The listing, Silk DreamSack Sleeping Bag Liner has ended.
100% Silk lightweight and small; sleeping accessory for overnight trips; never been used; description from website includes "The Original DreamSack® acts as a sleeping bag liner, or as an extra layer of sheeting in a bed...cool when it’s warm, and adds an extra layer of warmth when it’s cool....folds up into a small bag for convenient traveling..." I paid $70 and the ones I looked up run $62.