There are some days when throwing your hair up into a ballerina bun is the only option to keeping your sweaty strands off your neck. And besides being perfect for a hot afternoon, the style requires zero heat styling -- one factor that's sure to keep you cool.

Enter the messy topknot: a flirty upgrade to a sleek and prim ballerina bun, which takes just minutes to create. Not only will it keep your strands frizz-free in the humidity, but it's a great post-gym hairstyle that will easily take you from treadmill to drinks.

To find out how to master the messy style, watch the video above, which features celeb hair pro and John Frieda international creative consultant Harry Josh working his mane magic on Whitney Port.