Redken Styling Iron Silk 07. Ultra Straightening spray for amazing, frizz-free results. Redken Iron Silk 07 is a super-smoothing flat-iron spray that works in conjunction with your hair straighteners to deliver sleek, shiny straight locks every time. As well as thermal protection, the spray is also humidity resistant, ensuring your hair remains as you styled it, without frizz. Once straightened, your hair will look and feel softer, sleeker and smoother with a natural, radiant looking shine.