Mars Wellness Heated Neck and Shoulder Wrap: This unique cold heat pad provides instant pain relief from everyday aches and pains. To use a heated neck warmer, lay the neck wrap on a polyester cloth or a polyester towel with a lightly moistened surface, then place them into your microwave. On first use the neck and shoulder heating pad may appear a little damp, this is normal as the moisture from the stones and seeds is released. Our heating pad for neck pain relief will remain at a comfortable heat for up to an hour and can be reheated, please allow the wrap to cool down between uses. DO NOT MICROWAVE HEATING PAD FOR MORE THAN A TOTAL OF 3 MINUTES.--- About Us: At Mars Wellness, we aim for complete customer satisfaction. We won’t settle for anything less. If for any reason you are not satisfied with our heating pad microwavable, please reach out to us right away, so we can help you.