Man, I just paid 10 bucks for a rice sock I could have made myself for cheaper. I was at Bed, Bath, and Beyond and asked for the heating pads. What I got was "The Original Bed Buddy" microwave heat-pack. I thought to myself, "this better not be a rice sock. I mean, my understanding is that those wear out after so many uses." I thought that the material inside might be some space aged material that can absorb heat over and over. But no, its rice. I recognize the smell after heating it. And nothing on the box or instrctions say it is rice or that it will eventually wear out. But its rice. This is just a warning to you all. No need to pay $10 for a rice sock you can make for less than 5 bucks.