The Wonder Pax: Reusable Hot/Cold Pack

This size is large (meant for use on areas such as your back!) reusable, cool/warm gel pack, at the click of a button it will reach 130°F (54°C), stimulates circulation, can be used for arthritis pain and relief, muscle spasms, joint pain, sports and recreational therapy, and tons of other uses. Retails for $149.90!