A TravelSheet Coolmax from Coocon is a lightweight sleep sack that lines your sleeping bag or bed. It features a pillow pocket and a top opening, not a side opening. The fabric is a very stretchy knit and most people find it easy to get in and out of even without the side opening found on our other TravelSheets. TravelSheets keep your sleeping bags clean and they are much easier to launder than your whole sleeping bag. Washing just your liner will keep your bag from excessive wear and tear, but with the ability to easily wash the TravelSheet, you can always sleep clean and comfortable. Sleep with the peace of mind that only comes from the knowledge that you are sleeping free from dirt and germs.