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Memory foam is a special type of material which reacts to pressure and temperature causing it to mold and conform to shape accordingly. Therefore when it comes to sleeping on bed pillows, the foam creates a mold around the shape of your head, neck, shoulders, ears and any other body part which it comes into contact with. The traditional and most common type of foam is polyurethane, also known as viscoelastic foam. There is also another variant which includes a portion of gel, which is similar to the aforementioned, but this type has thousands of small gel beads in its mix. The gel memory foam pillow is slightly more expensive, newer on the scene, and has its benefits over its peers in that there is less heat retention thus allowing a cooler sleep surface.