MPEG2 version. We had to get the beauty into the OTS to see if she liked it. Answer, hell no! Some girls like this thing, and some hate it. In her case, her beautiful face is just too thin for the FF and she experienced leaks, bubbles and nothing but discomfort. She stuck it out though for a while, as we tried to adjust it, but not gonna happen. So, this will be the first and last time you will probably ever see Sierra in the OTS. Lots of talking through the mask, shes funny.