Carefully examine bottle before each application. If bottle shows signs of wear, it should not be used. Do not use boiling water or strong chemicals in bottle. Do not place bottle on radiator or permit contact with hot metal. Do not fold, sit, or lie on bottle during usage. For either hot or cold applications to sensitive skin areas, wrap soft cloth or towel around bottle. Avoid contact with ointments which may contain oil or other ingredients injurious to rubber. If contact is unavoidable, wash bottle promptly with soap and water. Do not expose bottle to direct sunlight or other heat. This product contains dry natural rubber.