Tim I am a big guy to I called HSS to see if they could make me a custom harness to fit me because my dad has the 3x and it wont fit they said they couldnt and the wait limit is 300 like you said so as of right now I am using a belt that I bought at the pennsylvania hunting show this year until I figure something else out there website is www.silentslide.com I am also looking to get a harness to.