Reactor Thermolite Extreme

Ideally, everyone should be using some sort of sleeping bag liner: it protects the bag and means you won’t have to wash it as often (which eventually degrades the down or synthetic fibre); but if you need more warmth than protection, this is the liner to choose. Fast-drying, premium quality Thermolite yarn is cuddly and soft  but lighter and more packable than fleece. The higher-grade, 110g/m² fabric claims to raise your bag’s overall temperature by about 15C.