Hair Trend: Sleek Straight Shiny Hair

For long-lasting sleek locks like Rani Mukherji's, prep hair with a thermal-protectant spray, separate hair into 1/4 to 1/2-inch sections, then use a comb in front of your iron to make sure the hair is smooth and straight before you put it in your flat iron. Next, add a shine gloss made with silicone and finish up with a light-holding hairspray. This gives you gorgeous stick-straight hair that humidity can't touch.

Rec: CHI 44 Iron Guard Thermal Protection Spray