In order to give you a new level of comfort, we have added a layer of memory foam on top of the highly resilient base foam. This design approach enables the wedge pillow to have the desired cushion while still providing gentle support to elevate the upper body or legs, or to use as a trunk stabilizer for side-lying position. Designed for patients with acid reflux, problem breathing, poor circulation, back or neck problems. Can also be used for foot or leg elevation. This pillow provides a comfortable, gradual slope and uses gravity to keep reflux down and airways open. Furthermore, this new and improved version has incorporated built-in channels between the top memory foam layer and the base foam to enhance air circulation. Every product comes with the trademark InteVision on its packaging (U.S. patented). Note: for people who want to purchase extra pillowcases, we have just released an optional 400 thread count, 100% Egyptian cotton pillowcase (sold separately and available on Amazon).