I've seen them, they've actually been around awhile....it's a joke, and can be kinda dangerous. They are usually neoprene, so they make you sweat, and yes just like wrestlers cut weight...but people think this is actual weight loss, it's just shedding water....
People are lazy and it pisses me off! Always looking for an easy magic pill(ie body by vi...) and as a trainer/strength coach/pt it pisses me off to no end! Like all the years I've spent researching and studying this stuff, and then people jump to shit like this cuz obviously it's that easy to be in great shape/health...it's so simple, why didn't I think of it while I was reading all those anatomy, biomechanics, physiology, psychology, nutrition books and studies and research papers.....