It works very slightly, but in all honesty, it will not save you in the final moments.
It does not actually draw water out, it creates heat that makes you sweat and with saran wrap has a bit of heat and sweat, not much else....No drawing action is created at all, it is not a Wicking effect.
Keep dieting, get on point, many other things out there that do not make you a stinky, sticky mess.
OH, BTW, i tried it, and fell for it, and learned..