I doubt very much it would burn more calories - it'd just make you get dehydrated faster, and lose water weight.
The only reason it'd make you burn more calories is if it added a lot of weight for you to have to lug around during your workout - and there's safer ways of doing that for increased calorie burn - like weight vests.
Really, I think it is a fad. At best, it will be completely useless, and at worst - it will rapidly leave you in a dangerous state of dehydration.
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