The Sea to Summit Talus series are a fully featured down sleeping bag suitable to take anywhere but the most extreme environments. The Talus series offers excellent warmth to weight ratio but incorporated into the classic relaxed mummy design are many innovative and comfort enhancing features. The hood is designed to cocoon your head completely in a way that maximises the available loft without making it feel claustrophobic. There is an adjustable collar to help fine tune your temperature control and both its draw cord channel and that of the hood are buried deep within the down so there are no harsh edges to push into your neck or face. There’s a discreet zippered pocket for your MP3 player or valuables, and the main zipper has an anti snag system that really works!The cut of the bag and baffles are engineered so that none of the down is restricted from reaching its maximum loft (and therefore insulation value) – a simple principle to state but a surprisingly complex one to render practical. It involves using differentially cut,3-dimensional side-walls and curved baffles.The Talus series introduces a new Nylon 2D NanoShell outer shell fabric, specially engineered to be very breathable yet still manages to have excellent water resistance. Good breathability is essential in minimising condensation of body moisture on the inside of the shell, a problem that over a number of nights can dampen the down filling enough to compromise its insulation value.Relaxed Mummy ShapeThe relaxed mummy shape of the Talus is designed to maximise thermal efficiency and minimise overall weight. It is cut with a larger hood, broader shoulder and large chest to provide a comfortable sleeping bag. Features Relaxed mummy; Nylon 2D NanoShell™; Differential cut shell with 3D side walls; Offset baffles; 60/40 fill ratio; Side block baffle; Anatomically tapered foot; Zip draft tube with anti-snag; Neck draft tube with dual elastic adjustment; Cushioned internal hood draw-cord with dual adjustment; 2 way YKK #5 zips medium sized internal zip pocket; Includes lightweight Ultra-Sil® compression bag and a combined storage cell / laundry bag. Sea to Summit Talus TS1 -5 °C Ultra Light Down Sleeping Bag