This little watermelon slice is fun and functional! Use it to keep your food and beverages warm or cool on picnics or for school & office lunches. You can also use it as a hot or cold compress to relieve aches and pains. Heat by placing in hot water and cool by putting in the freezer. The reusable tough vinyl pack contains a special non-toxic thermal gel. Measures 2.8 x 5.2 x 0.4 inches.