Cura-Heat Back & Shoulder Pain's 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. Simply open the sachet and apply to clothing/ underwear where the heat radiates through to the source of pain - decreasing stiffness, improving mobility and relaxing tense aching muscles. Non-medicinal, fragrance free and with a thin discreet design, Cura-Heat provides a convenient way to manage your back and shoulder pain. Cura-Heat Back & Shoulder Pain is available in 1/3/4 & 7 packs