Cura-Heat Back & Shoulder Pain Relief 7 Heat Patches Cura-Heat's penetrating heat action lasts for 12 hours and once removed the pain relief can continue for a further 12 hours, resulting in up to 24 hours pain relief. Open the sachet and apply to your clothing/underwear where the heat radiates through to the source of pain-decreasing stiffness, improving mobility and relaxing tense/aching muscles. Fragrance free, non-medicinal and with a thin  and discreet design. Cura-Heat Back And Shoulder Pain Provides a convenient way to manage your back and shoulder pain.