4 season warmth with earth friendly features. Cocona Recycled liner insulated with PrimaLoft Eco all surrounded by EcoSensor recycled shell material keep you comfortable on ski tours in the Cascades or backpacking in the High Sierras. The zero-degree Nahche fits the bill for the worst Mother Nature can throw at you. Dual draft tubes ensure maximum heat retention and the ergonomic hood (with an integrated pillow pocket) makes for comfortable sleeping.