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Down pillows are filled with the soft under feathers of ducks or geese, known as down. These pillows are known for their plush and luxurious feel, providing a comfortable and supportive sleep surface. The down filling allows for excellent insulation, keeping the sleeper warm in colder temperatures while remaining breathable in warmer weather. Down pillows are often preferred by those seeking a soft and lightweight pillow that molds to the shape of their head and neck for a customized sleeping experience.