Food grade silicone fill the small pillow ?Safety and Natural Comfort?: Filled with food-grade silicone and wrapped in 100% cotton covers, willai pillows are highly breathable, reducing overheating and staying soft and cozy even after repeated washing. ?Easy to Clean?: This pillow and pillowcase are conveniently machine-washable. They've been machine-washed 300 times and retain their original shape, keeping your pillow and pillowcase fresh and clean. They're incredibly soft, breathable and perfect for all seasons. ?Designed for Comfort ?: This pillow has been ergonomically designed and tested.