The Dreamliner230 is midweight sleeping bag liner made with Aussie Merino wool. Merino wool acts as a thermo-regulator, keeping you cool in warmer climates and warm in colder climates. It's odour repellent, extremely breathable, silky smooth and non-itch. Ideal for those camping in extremely cold temperatures, the Dreamliner weighs in at 475gms and increases sleeping bag performance by 7-10℃.