Hi. There are 40 packets of 2 each, so there are a total of 80. The pairs come joined, but can be opened separately if you just need one. If you just need 1, open one side of it and it still keeps the other 1 intact and un-used. Hope that helps. Contact me again if you still have questions.
There are a total of 80 individual hand warmers. Each packet contains two of the individual handwarmers, for 40 packets. You can open each packet individually to open only one handwarmer at a time. I always use two handwarmers, so I open two of the individual packets.
40 packets, each contains 2 individual pieces= total 80 pieces. They can get to 57 Degrees Celsius, as it warns on the packet, so use a covering between you and the heat pack if you have numbness or are concerned about heat sensitivity.
If you have 40 pairs of shoes, you have 80 shoes. If you have 40 pairs of hand warmers, you have 80 individual packets: one for each hand. The hand warmers are packaged in pairs, though each packet is sealed individually, so you don't have to use an entire pair. You could use only one warmer if you wish.