What Our Gearhead(R) Experts Are Saying:"I stash the Tracer liner in my pack on every trip-it weighs almost nothing, adds a noticeable warmth bump, and helps keep my bag cleaner longer. I especially like the fit; it doesn't twist or slide around thanks to the Spoon-shaped cut."We count grams, but we never cut comfort. The NEMO Tracer Sleeping Bag Liner lets us stretch our sleeping bag's performance without adding bulk or weight. Designed to match NEMO's Classic Spoon(TM) sleeping bags, the Tracer hugs the contours of our sleep system, eliminating cold spots and enhancing warmth from head to toe. Made with 100% recycled THERMOLITE(R) EcoMade fabric, the liner uses hollow-core fibers to trap body heat efficiently while staying breathable for comfort on warmer nights. FUZE(TM) antimicrobial treatment keeps things fresh on extended trips, reducing the need for frequent washes. With a packed size smaller than a water bottle and a barely-there weight, the Tracer is a no-brainer for minimalist missions or extending the lifespan of our favorite bag.