Cura-heat back pain max size are twice the size of regular cura-heat back pain and cover a larger area of the lower back, making them more suitable for people who desire warming relief over a larger area and who may be suffering from severe back pain. The penetrating heat action of Cura-heat direct to skin back pain max size lasts for 8 hours and once removed the pain relief can continue for a further 8 hours, resulting in up to 16 hours pain relief from muscular and joint aches and pains.