I love Thermawraps--they are kind of arched so they cover the whole neck area and last for up to 8 hours at a time. That kind of long term heat gets really deep into the muscles. I have fibromyalgia and this helps immensely. I also use capsacian if I run out of thermawraps, but it gets really hot since its made from hot peppers so use gloves to put it on and as they say buyer beware.