3 of 4 people found the following review helpful
SCIENCE!!! Gotta love it.,
This review is from: Heat in a Click Instant Re-Useable Heat Pack Heart Shape (Colour Varies) (Personal Care)
First let me say that the two previous 1 star reviewers have no idea what they're talking about. Who buys something without reading up on it first? If the description above isn't detailed enough for you then google "click heat pads" or "clickable heat pads" and you can find out all you need to know before putting your money down for one. HowStuffWorks even gives you all the science behind it if you're curious.
Next, these aren't a replacement for hot water bottles or pads you can heat in the microwave. There's really no point in using them at home. They're great for situations like camping, water sports, weekends away, walking home after a night out, etc. I use them for warming up after surfing and my brother uses them when he's working the night shift. My sister is getting some for going skiing this month.
Some are designed and marketed for therapeutic treatments but there are much better products out there for that. These are for outdoor/travel/emergency situations and for that purpose they're perfect.