I first bought this type of product years ago, and I love having them around and enjoy getting them as freebies or as an add-on to orders. While they are primarily marketed for "sensual" massages, they are great for general purposes like relieving cramps and muscle soreness. Or throw them in a quick sewn carrying pocket to use in the winter. The main benefit with these is that, not only are they inexpensive, they're REUSABLE! And last a long time, too. You just have to heat them up in hot water and they're as good as new. Much more eco-friendly than single use products and I would recommend everyone having at least one of these around.