This reusable and sustainable heat and/ or cold therapy pack can be used to apply hot or cold therapy for both your shoulders, neck and upper back. Simply heat in the microwave or place in your freezer by following the directions provided. These masks are locally made and filled with Canadian sourced wheat. Always take caution when using a product that changes in temperature. Always speak with your healthcare provider if you are unsure if you should use this product. Made by Created Mother.