Lifeventure thermolite travel sleeper description our thermolite sleepers made with a blend of thermolite and modal fabric offer both extraordinary warmth and breathability whilst remaining light and portable it can increase sleeping bag performance by up to 15 degrees celcius and is soft and stretchy for greater freedom of movement features use on its own or as a sleeping bag liner treated with permanent antibacterial treatment 50 thermolite and 50 modal fabric machine wash