FastAid's reusable hot and cold pack is designed with high performance, non-toxic gel and a strong, comfortable nylon outer and towelling for added comfort. Providing fast pain relief, anytime, anywhere, the pack is easy to cool down by placing it in a freezer or to heat up using a microwave. Ideal to assist with easing headaches, toothaches, general bruising, minor burns, reduces swelling and inflammation, and treats joint and muscular aches and pains.