all i know is when I was 688 pounds at 6 foot 6 i was diagnosed with sleep apnea now I am 245 pounds and gaining muscle and sleep apnea is still an issue... I notice when I sleep with it I train better the next day and feel better overall. I can get them as well if you need them hit me up Bigelle510.Cruisen.jpgIMG00327-20091001-1952.jpggym3.jpg all me!!