Relieve shoulder/neck/lower back pain fast, just place THERMA PLAST Air-Activated Therapeutic Heat Pad on your shoulder/neck/lower back, it will help relax the tense areas, improve blood circulation, and repair damaged tissues. Easy to carry, can be used anytime, anywhere, and gives you continuous warmth for up to 8 hours. How to use 1. Take out the heat pad from the plastic outer pouch and remove the release paper. 2. Place the adhesive side of the heat pad to inner layer of clothing over the painful area. If the heat pad is placed directly on the skin for maximum heat level, persons with sensitive skin should check skin frequently during use. 3. To maintain constant heat, cover the heat pad with other clothing such as a coat or other garment.