The Large Heavenly Hot Pack is great for larger surface aches and pains. It works well for back pain, abdominal pain, growing pains, or if you just need a larger boo-boo bag. You can comfortably lay on the large hot pack and feel relief, as the fabric and rice filling are soft to the touch. The large size is great for any age helping to relax and fall asleep! Approximate Size: 13" x 20" - and is sewn into 8 pockets. How to use???? FOR HOT: Microwave for 30 seconds increments. FOR COLD: Place in plastic bag, freeze. Heavenly Hot Packs are fantastic when heated up, or tossed in the freezer for some cooling effects. The hot packs are filled with jasmine rice, which retains heat for lengthy periods of time without causing any odor or allergens. The rice is great filler ensuring the hot pack can contour to your body and is not rough or stiff. The fabric choices we have chosen are flannel because of the softness and durability of the fabric. Foot warmers are made with minky as well, adding luxurious comfort and softness. Cleaning Instructions: simply spot wash with a damp cloth or baby wipe. You cannot actually wash your hot pack as the rice will disintegrate. Rest assured, any germs that the hot pack does accumulate, die in the microwave because of the heat it produces.