Naturo Relief Pillows with rocksalt crystals are the perfect treatment for sore necks, shoulders, knees, and spine. Heat in the oven at 175 degrees for 10-15 minutes or keep in the freezer and use as needed. Cold therapy helps reduce swelling and pain brought on by injuries. Doctors recommend cold therapy as an anti-inflammatory for painful swelling. These pillows are available in square shape for pressing against the painful part and also in a long pillow-form with 3-4 pillows joined together to form a belt which can be used for the back spine.