A sponge pillow is a pillow made of sponge material. The foam pillow uses a special material - polyurethane foam, which can automatically adjust its shape according to the person's body shape and sleeping position, thus providing better support and comfort. Foam pillows are considered by many to be an ideal pillow choice because they can be adapted to different sleeping positions such as back, side and stomach.usually including sleep pillow, wedge pillow, shredded foam pillow and other products.