Our Microwaveable heating pad has a secure hook and loop seal, so you can add fresh filler whenever your old filler gets stale or scorched by over heating. Flaxseed, dried corn, wheat and rice are all great fillers for our natural Hemp microwaveable heating pads. And they all create a moist heating pad. Save money by filling it yourself or we can fill it with flaxseed for you. Herbal heating pads that are microwavable provide warm, blissful aromatherapy. But all to soon the scent will fade. With our heating pads you can add more herbs at any time, you can make the scent last and last!