Anodos. Many manufacturers in the sleeping bag world don't give bags 0 degrees and below EN ratings. This is due to the methodology of the testing process which diminishes the accuracy of the results. So, as to not give bad info to our customers these ratings are not published. Some manufacturers do give EN ratings to 0 degree bags... but, most do not and you won't find any EN ratings on really low temp bags. I hope this info helps!

ps. I have a Phantom Zero and have used it alpine climbing in Peru in very cold temps and been happy!