I used one years and years ago for a while, awful rubbish... Don't think it made any difference all... Very uncomfortable, totally screws up your breathing and makes you very hot and sweaty so you get nappy-rash on your neck...
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I used one years and years ago for a while, awful rubbish... Don't think it made any difference all... Very uncomfortable, totally screws up your breathing and makes you very hot and sweaty so you get nappy-rash on your neck...