According to Srixon, the ZXi7, which is a single-piece forged iron, is 7 percent softer than the ZX7 MkII iron it replaces, while the faces of the ZXi5 and ZXiU are 14 percent softer.
Flat irons seem pretty straightforward since they require just a few passes with a steady hand to do their job, but certain things can set a good one above the rest: a range of heat settings to ...