Reactor Thermolite Plus

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. Thicker panels around the chest and foot box claims to raise your bag’s overall temperature by about 11C.