Reusable Snap Heat Pack, Hand Warmers Click Heat, Hand Warmers Boil Click Heat Pocket, Pouch Gel Hand Warmers Cute Long Lasting Warmth for Camping, Outdoor, Hiking

These work just as described. Click the metal tab and it heats up right away. Smaller sizes work great as hand or pocket warmers. Larger sizes perfect to put against your abdomin for cramps.

While technically what I was looking for, the relative shortage of heating material means that they cool rather quickly. In a room-temp setting, the small warmer was hot for 10 min, and being thin, what heat it does hold after freezing solid is quickly lost.Pros: You can probably fit the small warmer in a glove Comfortably? probably not, but it'll fit.General Notes:- Container material: Looks sturdy.- Container seams: ??? Too soon to say. Seams are where this kind of handwarmer lives or dies.- Warming mass: ~ 1/2 of what I'd expect for hand warmers this size. This can, depending on use, leave unheaded regions.- Click-disk: Technically clickable. Though I'd question my ability to click it with my bare hands when they're cold.- Recharging: "Boiling?" Meh. I drop em in the pressure cooker to reset them. (Mind, I let it cool slowly, as it's essentially a sealed, water-filled bag in a pressure vessel > boiling temp - I'm not looking to test how well the warmers serve as steam balloons.)For the uninitiated: The chemical these contain is what you get when you mix baking soda and vinegar, and then boil it down - it's called Sodium Acetate. You will even see it used on foods (Salt and Vinegar potato chips, anyone?) Sodium acetate has the curious property of being able to be cooled below it's freezing point (56C / 132F) without actually freezing. Giving it a shock (that click-disk) while cool will start that freezing process, releasing heat as it happens. This instantly heats it back up to it's freezing point (132F), where it will remain until it freezes solid. place in boiling water to reset it.One of my points being, it's not a haz-mat scenario if one of these break. Getting it on your hands won't cause cancer or melt skin off, and flushing the contents down the sink is no different than pouring vinegar+baking soda down the sink.

I had to return these because you could not bend the disc to activate them making them pretty worthless. Would definitely not recommend.