Heated Salt Pillow is remarkable for easing stiffness in the joints by placing it on the straegic areas of the body. For Heat Gradually warm the pillow imn the microwave to 100 degrees. Start with 30 seconds. Add additional time to warm as needed. For Cold, Cold salt pillow may reduce swelling and inflammation. Chill it in the refidgerator. Filled with pure natural Himalayan Salt. 12" x 8"