Buying underwear that is fit to non-american sizes can be tricky.  Some work and others...well you know the drill.  I'm not a a big guy...average build.  I do work out, so if you do as well consider these carefully.  I've got some glutes and these to not play well with them.  If you want a thong, buy one.  If you want underwear that will cover that butt, pass these by.