If you are like most people, one pillow throughout the night is just not enough. There's the pillow that goes behind your back for support, the one between your knees for temperature control, and the two to prop up your head to aid in breathing. And, if you're pregnant don't forget to add one more for tummy support. The Sleeper Keeper was uniquely designed to follow the natural contour and shape of your body from head to toe. Perfect for sleeping and relaxing. The horseshoe-shaped head pillow allows you to attain the position and height that is just right for you. The extra-long midsection is the perfect width for back or tummy support. depending on the direction you choose for your Sleeper Keeper. The slightly curved end tucks snugly between the knees.