These are wonderful! They give off a moist heat that really penetrates. I have one that I made in a long tube for around my neck, I made it long and it stays in place while I sew, on the computer, walking around. I have another that is about 12" square and every 3" I sewed a seam, it makes the rice stay in place and the whole pad will sit up nice on a chair back. I also have some smaller ones that I put into my pockets in the winter when I walk up to get my mail :D