The Migrane ice pack is made of double-sided pvc and soft plush backing filling with flexible gel beads for best comfort experience. Both side of the ice pack can be applied, varying level of cooling effect, the soft plush side provides soothing cold prevent frostbite to the skin while the pvc side delivers penetrating cold for effectiveness. Get started with plush side for adaption then flip over the other side for intensive and long-lasting cold.The reusable headache ice pack provides full relief of head and deliver coldness to affected areas, helps relieve migraines, tension headache, sinus pain, cluster headaches, occipital neuralgia, can be used for summer cooling, sunburn calming. 2Pack migraine ice pack is more convenient to use, one pack in freezer is always ready to use.For cold therapy, place the gel pack in the freezer at least 2 hours or until desired temperature is achieved. Good for muscle aches, neck, sprains, swelling, bruises and joint pain. For heat therapy, heat the gel pack in microwave in 10-15 seconds intervals that helps reduce pain and increase circulation to promote rapid healing.