No power. No microwave. No flame — just a clever bit of chemistry you can hold in your hand, and reuse for years. Here's exactly what's going on.
Inside every pack is a food-grade gel — supersaturated sodium acetate — and a small stainless steel disc. The liquid is holding more warmth than it should, just waiting for a reason to let go.
Flex the disc and you give it that reason. The gel crystallises in a chain reaction and releases its stored heat instantly. Drop it in boiling water later and the crystals melt back to liquid — ready to click all over again.
It stays at a gentle, soothing warmth — warm, not scalding — and how warm it feels depends on the pack size and the room. If your skin is sensitive, rest it over a layer of clothing.
Again and again. Once it cools, just boil it to reset and it's ready to use all over again.
No. Packs activate by flexing the disc, not by heat. Boiling water is only for resetting — microwaving can damage the seal.
It depends on the size of the pack and how warm the room is — the bigger packs stay warm for a good while. Boil to reset whenever you need it again.
Yes. Click the disc for instant heat, or lay it in the freezer for cold — one pack does both.
One click and you'll get it. Find the pack that fits where it hurts.