Increases sleeping bag performance by up to 14 Degrees with super-insulating 110g/m Thermolite fabric. Thermolite is a hollow core fibre that provides extraordinary warmth for its weight and remains extremely breathable. Spacious design allows for a comfortable night's sleep, even when the mercury plummets. Perfect for extending the season of your sleeping bag.
Features: 110g/m2 Thermolite construction throughout Adds up 14 degrees C to warmth to a sleeping bag Mummy shape with a box foot Draw cord hood with mini cord lock Packs into its own Ultra-Sil stuff sack