This foldable pillow with a one-piece design is perfect for both back and side sleepers. The pillowcase combines a firmer fiber insert with a softer goose down insert, allowing users to switch according to their preferences. The design provides a snug fit for side sleepers and ideal support for back sleepers. When sleeping on the back, the pillow's concavity creates a cozy and secure feeling for the head while keeping the neck at a comfortable height. When sleeping on the side, the elevated design on both sides perfectly conforms to the neck and shoulders, allowing for smooth turning.