Our newest accessory, the Tracer sleeping bag liner, is incredibly soft and patterned to match our Classic Spoon(TM) shape contours for extra comfort and light warmth on any overnight adventure. The physical layer helps shield your bag from oils and sweat, and Tracer is also treated with PolygieneA(R) Odor Control Technology, an antimicrobial finish that inhibits odor-causing bacteria. By allowing users to extend the time between laundering, this bluesignA(R) approved odor-free finish protects a sleeping bag&&';;s performance and longevity while also reducing micro-plastic shedding into the water stream. Tracer is made with lightweight THERMOLITEA(R) EcoMade fabric, a material woven from 100% recycled yarns with hollow core fibers. These hollow fibers efficiently trap heat to moderately extend the temperature range of your sleeping bag without adding bulk or excess weight to your pack. Though Tracer is optimized for NEMO Classic Spoon bags (Disco(TM), Forte(TM)), it can be used as a layer inside any sleeping bag, from rectangle to mummy style. Features THERMOLITEA(R) EcoMade fabric with hollow core fibers offers unmatched warmth-to-weight heat retention. Made with 100% recycled yarns. POLYGENEA(R) antimicrobial finish extends time between laundering, increasing sleeping bag longevity and reduces micro-plastics in the environment. POLYGENEA(R) Odor Control antimicrobial finish is bluesignA(R) approved. Reduced washing saves water, energy, and detergent waste. Contoured Spoon(TM) patterning for Classic and Ultralight options, as well as a 3D footbox, add comfort where you need it. Packs into a tidy stuff sack equipped with drawstring and webbing handle for easy carry. Hardware-free for head-to-toe comfort. Protected by the NEMO Lifetime Warranty.