1. Size: various sizes and design are available
2. It is a disposable and portable product, easy to provide temporary relief of minor muscular and joint aches and pains accociated with overexertion, strains, sprains and arthritis. It will gradually get warm and last for at least 8 hours.
open the outer pouch and shake gently, leaving the internal pack to react with air. It may take up 20 minutes to reach its therapeutic temperature, place on pain area. For maximum effectiveness, it is recommended to use for 8 hours.