The Travel Size Heart Warmer is so cute that you'll want to give it to everyone as a gift - for Anniversaries, Valentine's Day, Mother's Day, a friend's birthday or just because! Measuring 5 inches by 5 inches, the Mini HeartWarmer can be stored in the freezer or heated in the microwave. The Mini Heart Warmer Pillow is filled with premium whole buckwheat seeds grown without fertilizers or pesticides that provide soothing comfort when heated in the microwave or chilled in the freezer. Buckwheat seeds are the preferred filling for therapy packs over rice or other grains and recommended by professional spas and salons as they retain a gentle moist heat longer. Best of all they are naturally fragrance-free, hypoallergenic and eco-friendly.Liners are sewn shut without a zipper to allow for microwavable heating.