The THERMOLITE® Reactor liner is our best-selling and lightest thermal sleeping bag liner. Featuring a mummy shape and Thermolite® Pro fabric, this liner incorporates new infrared technology and stretch fabric to provide additional warmth, versatility, and enhanced insulation. The drawcord allows for added adjustability, ensuring maximum comfort. It's ideal for use in cold conditions. Features Thermal Boost of 12% when used in a 1 season sleeping and 6% in a 3 season bag Stretchy, Thermolite® Pro fabric is incredibly comfortable and utilises Infrared Technology to increase warmth without adding weight. Lighter weight and more packable than fleece. Technical mummy-shape and available with or without a drawstring in the hood hood Easy care – machine wash with no special soap is needed. Avoid fabric softeners and dryer sheets. HEIQ Fresh bio based treatment for added odour control Keeps sleeping bag clean. Packs into its own Ultra-Sil stuff sack. ADDED WARMTH: Up to 6% in a 3 season bag and +12 in a 1 season BEST USE: Backpacking, Camping COMES WITH: Ultra-Sil stuff sack MATERIAL(S): 50% Thermolite Pro & 50% Thermolite EcoMade SHAPE: Mummy