Up to 16h Pain Relief* Heat Patch Penetrating Heat Action* * Cura-Heat's penetrating heat action 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. Cura Heat Direct to Skin Back & Shoulder Pain can be applied directly to the skin for those who prefer direct skin application heat therapy. Simply open the sachet and apply directly to the skin over the painful area 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 and discreet design, Cura-Heat Direct to Skin Back and Shoulder Pain provides a convenient way to manage your back and shoulder pain.