Heating temperature of heating pad: gear 1-28℃, gear 2-29℃, gear 3-31℃, gear 4-34℃, gear 5-37℃, gear 6-39℃, gear 7- 42℃, gear 8-47℃, gear 9-51℃. I bought this for my partner who has raynaud’s, a condition where her hands can often have interruptions of blood flow during cold weather. The idea was that they will keep her hands warm throughout winter whilst also feeling as though my Grandad is there with her.

They contain a main ingredient, such as activated charcoal, iron powder, or sodium chloride, that reacts to force (shaking) or a catalyst (like air or boiling water) to release continuous heat.Rechargeable hand warmers charge from a USB port on a laptop or wall outlet, and most of them work as a backup battery for your phone. Zippo is one of four models that comes with a bag, and it’s the only one that must be wrapped during use to prevent burns—our measurements were taken with the Zippo in the bag.

I suffer from Raynauds and even on mildest of autumn / winter days from September to April I can sit in my office with cold, numb, and white fingers despite my whole body being warm.The buttons are identical and are located on either side of the device, so it’s easy to press the wrong one when you’re fumbling with it in your pocket.