Down pillows are becoming increasingly popular as a sleep aid for side sleepers. They are a good option for people who are allergic to feathers or who want a more comfortable pillow. Here are some of the benefits of using a down pillow: -Down is a natural material that is lightweight and warm. -Down pillows are customizable, so you can make them as firm or soft as you need them to be. -Down pillows are machine-washable and dryer-safe.