ice pack for neck 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 ice pack provides full relief of neck and deliver penetrating deeper coldness to affected areas, helps relieve neck and shoulder pain, reduce swelling related to sports injuries, speed up post-surgery recovery, relieve arthritics of shoulder and chronic joint pains. The skin-friendly neck ice wrap conforms to the curvature of neck and shoulders snugly. The ice pack wrap is also versatile to apply to other body area which you are needed. Place the ice pack in the plastic bag provided in the freezer for the next application. For heat therapy, heat the pack in microwave in 10-15 seconds intervals that helps reduce pain and increase circulation to promote rapid healing. 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.