Cura-Heat Direct to Skin Back Pain Max Size can be applied directly to the skin for those who prefer direct skin application heat therapy. Cura-Heat Direct to Skin Back Pain Max Size are twice the size of regular Cura-Heat and cover a larger area of the lower back, making them suitable for people who desire warming relief over a larger area and may suffer from acute back pain. 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 discreet design, Cura-Heat provides a convenient way to manage your acute back pain.