The Bee comes with a removable heat pack that can be warmed in the microwave or cooled in the freezer as desired. The heat pack is made in Canada from all natural ingredients, is hypoallergenic and safe and easy to use. The Bee also has a washable cover so that it is easy to keep clean (machine wash and dry gentle cycle / cool or warm). Big Bee’s warm-up feature promotes relaxation and provides natural relief from aches, pains, stress, headaches, tummy aches and ear aches. It’s gentle warmth also helps settle children at bedtime so they can achieve a good nights sleep.