The THERMOLITE® Reactor Fleece liner is Sea to Summit’s warmest sleeping bag liner. The regular Reactor Fleece Liner featuring a drawcord for adjustment and versatility, is made from Thermolite® fabric and grid fleece for optimal heat retention. With the same features as their Reactor Liner, the fleece addition offers added warmth for maximum thermal boost. Features. Traps insulating air to increase warmth of a 1 season sleeping by up to 22% and 10% for a 3 season bag Sustainable construction- 60% Thermolite® All-Season fabric, which is made with 100% textile waste and GRS Certified, and 40% polyester yarn Treated with Heiq Fresh FFL biocide-free effective odour control Technical mummy-shape with drawstring hood. Easy care – machine wash with no special soap needed. Avoid fabric softeners and dryer sheets. Ideal for use as a sleeping bag in warmer weather or sandy environments. Packs into its own Ultra-Sil stuff sack Weight 390 g Packed size 14 × 9 cm The reactor fleece is perfect for… Backpackers looking to add warmth to their sleeping bag for winter camping Warm-weather campers who don’t need a full sleeping bag Paddlers or desert users who want an easy-care summer sleeping bag they can easily wash the sand out of Backpackers looking to extend the performance of a (perhaps older) sleeping bag for winter camping Reactor Fleece Sleeping Bag Liner - Mummy with Drawcord - Regular