Deep Relief Warming Heat Patches provide warm, penetrating relief of muscle pain associated with the neck, shoulder and back. The patch’s soothing action takes effect immediately and lasts for hours, increasing mobility to help keep you moving. Flexible, greaseless and stainless, the patches can be worn discreetly under clothing. Adheres firmly and removes easily. Product information is provided by the product vendor. This content is a summary for informational purposes only and does not have all possible information about this product. It should not be used as a substitute for advice from health care professionals, as this information alone does not assure that this product is safe, effective, or appropriate for you. For more detailed information on this product, including reported and possible side effects and contraindications, refer to the manufacturer's monograph, or speak with a health care provider.