Description Thermo-Shield insulation and a soft touch Microtex lining combine with Amplify (expand) technology in knee and hip area to minimize heat loss, as well as a layer of Illuminate warmth reflector, makes this a great three-season sleeping bag up to -2°C, and extreme rated to -10°C. It also features a reflective zip puller and internal pocket for valuables. Features Thermo-Dynamic contoured design Elastic (Amplify) stitching to minimize heat loss around hips and knees but gives you room when you need it 2-way zipper with draft baffle 1 x layer Illuminate – Illuminate is a durable silver coated fabric that aids the bag to retain body heat. It is sandwiched between the inner lining and outer layers Insulated with Thermo-Shield Internal pocket for valuables First Ascent Amplify 1500 Sleeping Bag