Selected Goose Down Filling, Material is 400T20D Nylon, which is a kind of waterproof and Breathable Fabric. Comfortable, durable and skin-friendly. The Material is Soft, Comfortable and Breathable, Spring Back Quickly to Make Sleeping Bag more Fluffy and Warm. Backpacking Sleeping Bag: A lightweight mummy sleeping bag with extra fill in the footbox for warmth. Cozy Backpacking And Camping Gear: The sturdy ripstop shell and cinched hood will keep you warm