Chattanooga Hydrocollator Moist Heat HotPacs - 15" x 24" Oversize Heating Pad for Pain Relief | Physical Therapy & Muscle Recovery | Ideal for Back, Shoulder & Joint Pain

This thing is awesome! When you first get it, you have to soak it for four hours. I keep it in a pan of water on my stove and change the water about every week. That keeps it fresh...it smells a little like the oatmeal bath product and gets filmy if you don't change the water often enough..but, it doesn't harm it. I love it! I got the oversized and it fits in a pan on my stovetop when I fold it three times. It covers my entire back, I am a grown adult woman 5'5" 150lbs. I love this and would recommend to anyone that needs awesome treatment for anything. It is so affordable and effective. It has sturdy tabs that allow you to pick it up when it's hot in the water. It holds the heat for about an hour. I wrap it in a beach towel and lay on it.