Intelex invented the award winning Hot-Paks® in 1995 and since then millions of people worldwide have benefited from this simple and affordable classic design. Hot-Paks® have set the standard for soothing warmth and comfort. You can even chill Hot-Paks® to cool yourself on a hot day or when cold pak therapy is what the doctor ordered! Quick facts : Simple to use - just warm in a microwave. Can be reheated hundreds of times. Do NOT immerse in water or wash in the washing machine - surface clean only with a damp sponge.