Before using the heat patch, carefully remove it from its case. Gently remove the protective film from the heat patch. Then, place it on the clean, dry skin of the affected area (back, neck or shoulder) with the adhesive side facing down. Press the patch firmly to make sure it sticks. The heat patch will start to heat up within a few minutes and will provide continuous heat for up to 8 hours. To remove, gently pull the heat patch by one corner.