the liquid warmer gets it pretty hot if its on for awhile---that is over 100. my buddy got tested and used 2 handwarmers banded to a m&m minis container and it was way too hot---110 plus. He said he poured it in the cup, swirled and blew on it and it cooled to 98 quickly. I wish i had personal exp. I wear 2 pairs of socks on one of my feet with the liquid warmer banded to the quick fix and it doesnt bulge too much, which is nice. My plan is to activate it on the way to the testing site, cuz it heats the urine in 10 to 15. havnt tried it yet but it should work