sleeping bag liner with integrated CELLIANTA(R) bioceramic recovery technology Recover faster, and be ready for the next day on the trail, with the UL Recovery Sleeping Bag Liner. Sleep better with integrated CELLIANTA(R) technology, clinically demonstrated to help you recover from fatigue faster. Pack this ultralight liner to help your muscles recover - while protecting your sleeping bag from dirt, odor, and body oils - and wake up prepared for the trail ahead. Use this ultralight liner to help you sleep more comfortably, recover more thouroughly, and perform at you best after a night&';s sleep in the backcountryWhether you run hot or cold, CELLIANTA(R) technology helps you stay at the right temperature while you sleepCELLIANTA(R) has been clinically demonstrated to increase local circulation, improve local cellular oxygenation, promote restful sleep, enhance performance, and speed recoverySoft woven fabric makes you sleep setup even more comfordable in the backcountry or frontcountryStands alone as a packable layer for travel and warm-weather overnights under the starsDurable, outside-facing seam construction is smooth and comfortable against your skinKeep dirt and body oils out of your sleeping bag with this easy-to-wash removable linerEasily reversible to fit right or left zip sleeping bagsMinimalist cinch-hood closure for one-handed temperature regulationStuff sack included Fabric: Recycled Polyester CELLIANTA(R) FabricCELLIANT Fabric contains a natural blend of bioceramic minerals that captures and converts body heat into infrared energy and returns it to the bodyPolyester stuff sack with liner fabric end cap