At zero degrees everything has got to be dialed for a good night's rest. This 4 season bag provides warmth with earth friendly features. Cocona Recycled liner insulated with PrimaLoft Eco all surrounded by EcoSensor recycled shell material keep you comfortable even in damp conditions. You'll have peace of mind (and a dry bag) if the weather's tweaking. An ergo foot box and hood, Pad Locks, and dual draft tubes all increase comfort and warmth, making the Winema a natural choice on any outing.