We tested many different fillings before choosing flaxseed for our therapy wraps.
We tried rice, barley, oats, and a few others. They all worked, but flaxseed consistently performed better in the ways that matter most.
Other grains used in hot and cold packs are water based. They tend to dry out in the microwave, they do not hold heat as long, and they often freeze into a solid block when stored in the freezer. This makes them harder to shape around your body.
Flaxseed behaves differently because it is naturally high in oil. About forty percent of the seed is oil, which means you are heating the oil inside the seed rather than heating water. Oil holds heat longer, similar to an old fashioned oil heater. When frozen, flaxseed stays flexible so the wrap can drape comfortably over your body.
Flaxseed also feels smoother and more comfortable against the skin. It forms to the body easily and has a pleasant weight that helps the wrap stay in place.
If another type of therapy wrap works well for you, that's great! There is nothing wrong with rice, barley, oats, or even cherry pits. We simply preferred flaxseed for its heat retention, flexibility, and overall comfort.