I will compromise and say 6-7 oz, but no less according to the cut out (it measures at .11 of an inch thickness on the cutout, 7oz.=7/64" or .109 of an inch). I don't think it's 3-4 oz thin only cause I really do think it was uncomfortable and heavy. Thus, the butt pillows. And, 7 oz still can conform a little to one's curves. For comfort, 5-6 would be cool, cause actually, it would be a bit lighter to handle and wouldnt drag down as much. Cause, a belt underneath the cumberbun is totally necessary for it to stay on her anyway. Just my ramblings. Hey the thinner it is, the lighter it is. So whatever you feel is better ie, thickness vs. mobility go fer it.