It perfectly aligns the baby’s head in relation to the shoulders and the rest of the body. It offers comfort & protection from the sudden movements and vibrations of the stroller. Can also be used on the rocking chair & car seat! One side is 100% cotton with hedgehogs in gray and the other elegant velvet minky! The pillow is filled with anti-allergic silicone balls. Cleaning: Machine washable at 40 C.