The Sissel Trisectional Hot-Cold Pac is the easy way to apply heat to the neck, shoulders or lumbar region. Used as a Cold Pac, it is a convenient and safer alternative to ice.The Hot-Cold Pac is simple to heat or chill. It has dual purpose, contours to the body and it is easy to clean. Even in the freezer, the Hot and Cold Pac stays soft and pliable. Each pack is filled with an innovative biodegradable gel that is designed to hold heat or cold longer. Cool the Hot and Cold Pac in the refrigerator, or heat it up in the microwave. Please note the color of the cover is BEIGE not blue as shown.