JohnRob:
Hi,The is designed to always be at 60 °C, much too hot for skin.
I did some work with PTC heaters a few years back and they are great for constant temperature, however I've not seen any where the transition (control) temperature is low enough to be useful for contact with humans.
I've not been following closely but have you looked at flat silicone heaters?
Because I'm really new to the whole thing, I did not even know which way to look