FHI has a superior collection of professional curling irons. FHI curling irons use advanced technology to yield impressive, quick results. FHI curling irons instantly heat up and each has its own built-in safety features. FHI curling irons also have a patented technology called Nano Fuzeion, which includes advanced PTFC ionic heaters and adjustable temperatures. Shop professional curling irons such as the FHI Heat curling iron 1 or FHI Heat curling iron 1 Ό.