Hey that has infrared heat -

[NOTE(Please Read):
Due to the fact that this product was recently re-designed to feature infrared heat, infrared technology is not explicitly mentioned on the product packaging nor within the user manual for this product. We are working on re-designing the packaging and user manual to reflect the presence of infrared heat. Instructions for use of this product remain the same. Please keep this in mind when you receive your shipment! ]
that is good

I have this one - http://www.healiohealth.com/tek9.asp...cific=jqkmcqj0

It has rectangular semi firm pads - in the picture on the site you can see the 3 sections - those are the pads.
They are kind of firm so I don't know it that would bother the same as the wires/cords in regular heating pads.
And I can't tell in the pictures iof the other one is made the same or not.

Why not email or call them or the manufacturer and ask for more info about it and maybe more pictures?

you might enjoy the king size better - it could cover most of your whole back.

I wish my IF heating pad was bigger, but we also have a TheraTherm Digital Rectangular Moist Heating Pad -14 X 27 for full back heating.
It's more flexible to place around arm or across shoulders if needed so they both have certain uses.

[Key Points of Infrared

* Infrared in electromagnetic spectrum – Natural absorption in the human body centers around 9 microns.
* Depth of Penetration – 6 cm (2.36 inches). [Heating pads, which provide topical conductive heat, only penetrate 2 - 3 mm.]
* Radiant vs conductive
* Our product’s infrared energy produces relatively cool temperatures (104°F - 113°F). Won’t dehydrate or burn.
* All systems come with hi-low power settings. On the low setting, after full heat up, the micron range holds steady at 9.1376 (9137.6 nanometers) based on surface temperatures of 111°F. On the high setting, the micron range is 9.1089 to 8.7778 (9108.9 to 8777.8 nanometers) based on the range of surface temperatures of 113°F to 135°F.]
http://myheatingpads.com/how.htm