Watched on youtube again how to get them hydrated. I've got 2 in the freezer and hopefully they will be frozen to use by tomorrow. I've used l for the microwave.....heated a minute and have to watch it....it can get hot, depending on the size of the microwave. I cut them down two squares so I can use them on my neck and shoulders. It's bulky so I've got an old shirt over it buttoned at the top so it holds it close to my neck in back. At first I thought I would make a cloth covering for it, but decided against it. The plastic kinda sticks to my skin, and I noticed it's like having moist heat, which is more healing to muscles than dry heat. The first couple of times of heating it up it felt like some water was coming out of it.....I guess that's normal. But so far I think I like using it. It's much lighter than a rice filled pad the same size, and it stays warm longer than the rice one......but I would say after about 3/4 hr. I want to heat up again.