I use an EX02 Heatwave. As the blood all flows through the kidneys, I figured it was an efficient way to keep the major organs warm. It only draws 0.6 Amps. Around £50 GBP
HEATWAVE Heated Back Support
For using with portable battery pack select EXO² Power Pack and Charger below. If seeking to ease lower back muscle strains, whether at home, on the motorcycle or when you want to chase the chills on an outdoor walk, this is an unbeatable combination product. Heated Lower Back Support/Kidney Belt with elasticated nylon sections, hook & loop (Velcro) closure, battery pocket with DC plug connector, heated panel at the lower back and pull-forward support handles for a tighter fit.
Power Packs must be ordered separately if required - see below
Power Requirement - Back Support draws approx. 0.6Amps
Mike
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