Frizz and flyaways start at the cuticle -- the outer layer of hair. Each strand of hair is like a shingled roof. When hair is smooth and has enough moisture, it lies flat. If hair is dry, damaged, or over-styled the 'shingles' stick up which causes frizz.
The most important thing for making strands stay where you want them is to add moisture. Hair that doesn't have enough moisture is difficult to manage and doesn't lay how it should when styling. To revive hair, use a deep conditioning treatment after washing or apply oils to towel-dried hair.
A common mistake that causes hair to frizz is rubbing a towel against wet hair when trying to dry it. Moving the hair in all different directions makes the strands stick up instead of lay down flat. Get rid of excess water by squeezing longer locks with a towel and blotting hair at the scalp.
For frizz-free straight hair, blow-dry one section at a time using a round brush. Be sure to keep the blow dryer pointed down at the floor so that the hair continues to be laid flat. When drying, keep dried and wet sections separated -- recombining them can lead to more frizz.
Before heading out the door, mist hair with a light-hold hairspray to hold down any flyaways that may pop up.
Curly hair is more prone to frizz because of the different way each curl lays. Hairstylist Kristan Serafino says to touch curls as little as possible to avoid separating them and lifting the cuticles. Curly hair should also be kept extra moisturized to help tame flyaways.
Sticky, humid weather can cause frizz for even the smoothest hair. If you're at home and know of humidity ahead of time it's best to add a rich smoothing product. However, if humidity has gotten the best of your look, Serafino suggests using it to your advantage for a stylish disheveled braid or loose bun.