high quality silk is the optimum fabric for minimizing packing size and weight. * Silk is soft against your skin and responds well to changing temperatures - it feels cool in the summer and is warm in the winter. * Mummy Liners made of silk are easy to hand or machine wash and dry quickly. * Woven with a grid-like structure of strong silk threads, Ripstop Silk is more durable and resistant to tearing than regular silk