Silk Sleeping Bag Liner, Rectangular, GreyThe silk sleeping bag liner is an ultra lightweight and breathable liner which can be used alone or in conjunction with a sleeping bag, for added warmth. It will keep you warm in the cold or cool in the heat, helping your body to regulate temperature effectively. Silk naturally helps regulate body temperature and wicks away perspiration. The liner comes in a tough ripstop carry case and is available in two shapes (Mummy or Rectangular) Ultra