Via their soft surface and all-natural wheat fill, Core's Heat Wheat Packs deliver natural, effective pain management by comfortably conforming to – and applying your choice of heat or cold to – virtually anywhere on your body. Available in many shapes and sizes, they are recommended for muscular aches and pains, headaches, back pains, headaches, sports injuries and relaxation, as well as for stress and tension relief. Cold therapy works by constricting blood vessels, resulting in a decrease in blood flow to the area of application. This helps to decrease swelling and promote healing. Heat therapy increases blood flow to the area to help relax muscles and decrease pain. Put them together and you've got a lot of natural healing at your disposal for relieving sprains, strains, tendinitis and other injuries, as well as stiffness and poor circulation. With so many choices, you're sure to find one that "hits the spot."