Same stuff as the boobie coolers I ordered. I have to say those were a good idea at the time, but not such a great investment. They go into your bra like inserts, supposed to keep your body cooler without the bulk of the vest.

BUT, I am flatchested and these things are huge so it looks like I am stuffing my bra, they bunch up on the bottom and after about 2 hours they begin to produce heat and you have to find cold water to submerge them again.