THERMA PLAST Air-Activated Therapeutic Heat Pad Back Relieve back pain fast, just place THERMA PLAST Air-Activated Therapeutic Heat Pad on your 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. - Specially designed to relieve back pain- Lasts for 8 hours- Improves blood circulation and relaxes the tense muscles- Easy to carry, can be used anytime, anywhere