Hairstyling Tip of the Day: Straighten Up! Looking for a new summer style but tired of the humidity causing your time-consuming hairstyle to fall flat as soon as you walk out the door? Skip all the primping and go for a straight and sleek or slicked back summer look using Keratin Complex’s 2-day Straight. It will give you long lasting style and protection from humidity so you can wear it down straight or slick it back into a sleek and shiny ponytail. Not only will you look stylish but you’ll also be keeping cool and preventing that hair from sticking to your neck!