The JT elite thermal lense will fit the JT Radar, JT Alpha and the JT Nvader masks. The thermal lense configuration has 2 layers to it seperated by a pocket of air. This changes the temperature differential between inside and outside and stops you from steaming up! The thermal lense system is more than 99% efffective at preventing steaming and will show a marked improvement over the standard antifog lense. Please note if you bought a mask with a standard lense you can upgrade it to a thermal in all of the elite models.