The ultra lightweight model with extra long plates works great on thick, long hair. BaByliss Pro Nano Titanium Straightening Iron features a built-in ionic generator and recessed LED electronic temperature controls. High heat levels up to 450°F. It maintains stability in ultra-high temperatures and emits negative ions in their most beneficial form for faster straightening, locking in the hair's own natural moisture. The BaByliss PRO Nano Titanium Straightener yields maximum far-infrared heat, penetrating the hair from within for gentle straightening without damaging your hair.