So I'm trying not to use blowdryers, so thought I'd try a flatiron - got a cheap ceramic and then went looking for this new Matrix Iron Smoother which is supposed to protect from heat damage from appliances up to 450 degrees - IT'S WONDERFUL. My hair was shiny and strong after using it, I didn't have to go over sections over and over to get it straight after air drying, and stood up to humidity amazingly several days later. It's from their Smoothing line - never used any of the other products - but I was intrigued by the ads and claims for protectant strength. The bottle (it's a spray-on) cost way too much, but it will last forever and ever.