Everyone has different sleep styles and needs. The density pillow line was designed for the individual sleeper to custom fit those styles and needs. Whether you are a stomach, back, or side sleeper you can choose the perfect pillow that's designed to give your neck, shoulders, and back the proper support and spinal alignment that they need. Thus, giving you the best night's sleep possible. Every DreamSleep density pillow shell is constructed out of 200 thread-count kinds of cotton and is filled with 100% Slumbersoft hypo-allergenic polyester fill. A gusseted custom color quilted sidewall was engineered into the pillow to provide extra support and reinforced corded edges are added to hold it all together and eliminate breakdown. Choose the medium density with a green 1-inch sidewall and 29 ounces of fill if you are a stomach sleeper, the blue firm density with a 1. 5-inch sidewall and 32 ounces of fill are for back sleepers, and purple extra firm density with a 2-inch sidewall and 34 ounces of fill is for side sleepers. This pillow is naturally hypo-allergenic for sensitive sleepers and for added convenience machine washable.