An analog hygrometer with magnetic back A tray with divider A divider for the bottom area Super absorbent polymers are crystal-like substances that can absorb lots of water, sometimes as much as 300 times its weight. Over the course of a few minutes, the polymers absorb water and turn into a sloshy gel-like consistency that is mostly just water. Once they’ve absorbed the moisture, the polymers will release the water and eventually, if left in a dry environment, will transform back into the dry crystal-like state. This is an alternative to the florists’ foam humidifiers, though the idea is pretty similar. Super absorbent polymers will release the humidity at very high rates—I use them to season humidors sometimes as opposed to just leaving open bowls of water—and while it’s a bit more of a high-tech solution than florists’ foam, the humidity still needs to be regulated.