Soft Synthetic Down fill. You will instantly notice the distinct quality and feel the premium texture - MoonRest Pillows are Machine washed and dry, Lined with durable polyester/cotton fabric protective cover, and filled with soft plump Hypoallergenic Down Alternative, thick and fluffy with a strong bounce-back, resilient and hypoallergenic; supportive for back, neck and lumbar. Down like comfort; this way you are less likely to suffer from the feathers sticking out and poking you.