The Casper Foam Pillow features three layers of supportive and cooling foam with a uniquely huggable feel. A meticulously designed inner layer contours to your head and neck in all sleep positions, while two plush outer layers offer cushioning comfort. We purposefully designed the pillow to prevent you from overheating. Tiny channels in the foam circulate air out and away. Plus, an extra breathable jersey knit cover looks cool and sleeps even cooler. Unlike other foam pillows, this one combines low- and high-density foams for a luxuriously squishy feel that keeps you blissfully comfy night after night (after night, after night ).