High quality 100% cotton sleeping bag liners are comfortable and compact for camping and travelling. Why choose cotton? Cotton sleeping bag liners are durable, comfortable and easily cared for. They are ideal for protecting your sleeping bag against grime and dirt avoiding the need to clean your bag. Cotton liners are also perfect for use in youth hostels and mountain huts in hot climates without the need for a sleeping bag. A cotton liner adds up to 2C of warmth to your sleeping bag.