It straightens It curls It smoothes It shines The Tress Press is a dual-purpose iron that allows you to quickly style even the thickest hair into super-sleek straight locks or add a bit of wave or curl. Ionic Technology uses the power of negative ions to reduce frizz for smoother, shinier tresses. Infrared Technology heats hair from the inside out to help maintain healthy locks. 1.25" (3.17 cm) floating plates provide constant contact with the hair to straighten in a single pass.