We invented a unique pillow-in-pillow design that's built to satisfy all sleepers. The Casper original pillow is both soft and supportive, so you don’t have to pick one or the other. We slept on over 60 different kinds of pillows from around the world to find the best fill types. The original pillow is filled with nearly a billion microfibers, so it is adaptive and will respond to your movements throughout the night. The outer pillow is a 100% cotton breathable percale weave. It increases airflow so you’re always sleeping cool. The original pillow is machine washable and dryable.