UTK Far Infrared Heating pad on Amazon. Mine is size medium pro. I had to ask my husband for link and am now astounded at what he paid for it.

https://www.amazon.com/UTK-Infrared-Heating-Cramps-Tourmaline/dp/B072FHBFMT

Hi I have one of these pads. I have the UTK one that is $200 https://www.amazon.com/gp/product/B072FHBFMT/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

My PT recommended it for me as she felt I was getting relief from the infrared gun she was using on my hips. I had gone for hip injections and the PA said do you know you have burns on your hips? They were not actual burns but discolorations under the skin from turning up the heating pad. I had noticed i needed to keep turning it up. Its called toasted skin syndrome. I had no clue--I looked just like the pics! I used the infrared pad a lot to start. Now I use it occasionally. Sometimes it feels great, sometimes, it pokes me in a sore spot. My therapist had one I could try. Maybe check that out?