Our newest accessory, the Tracer Blaze sleeping bag liner, is incredibly soft and patterned to match our Ultralight Spoon™ shape contours for extra comfort and significant warmth on any overnight adventure. Tracer Blaze is made with thicker THERMOLITE® EcoMade fabric, a material woven from 100% recycled yarns with hollow core fibers. These hollow fibers efficiently trap heat to extend the temperature range of your sleeping bag without adding bulk or excess weight to your pack.