Unlike a memory foam pillow, down pillow, or memory fiber pillow (which only uses the material in their name as filling), a hybrid pillow utilizes multiple types of filling inside one pillow for the best of all worlds, thereby earning its “hybrid” moniker. The Casper Hybrid Pillow features a three-layer foam + fiber design, which provides both ultimate comfort and support for a better night’s sleep, plus a soft plush knit outer shell as the cherry on top.