Extremely lightweight and roomy sleep sack or sleeping bag liner for hotels, youth hostels, alpine huts, boats, planes and trains - with Insect Shield insect protection. High quality silk is the optimum fabric for minimizing packing size and weight. Silk is breathable, soft to your skin and responds well to changing temperatures. It keeps you cool in the tropics and toasty in the mountains. Cocoon - Travels Sheet Insect Shield rhino