Quilts are taking over, and it makes sense: in a sleeping bag, your weight flattens the insulation under your body, rendering it useless. A quilt removes this useless layer, saving weight. The Corus is insulated with fill power 650 Nikwax Hydrophobic Down. Thanks to the hydrophobic treatment, this material is much less prone to losing its insulation if it becomes damp. Note! The temperatures are manufacturer recommendations. Quilts do not have the same sort of standardized tests that are common with sleeping bags. However, Therm-a-rest is a manufacturer we know and trust. - Regular size: for max. 183 cm users - Comfort temperature: 0ºC - Limit temperature: -6ºC - Down fill: 530 grams - Box baffles for great insulation - Snap closure at collar - SynergyLink straps keep the quilt in place on your sleeping pad - Fabric: 20 denier polyester - Liner: 20 denier polyester taffeta The down in this product is RDS (Responsible Down Standard) certified.