A diffuser might be universal when it comes to fitting around your blow-dryer nozzle, but as far as finding the right hair diffuser to suit your specific needs, you'll want something a little more personalized. According to hairstylist Leigh Hardges, there are three key features you want to check out when shopping for hair diffusers:
Figure out the right size
First of all, you have to make sure the attachment is compatible with the size of your blow dryer, but you'll also want to pay special attention to the diameter of the bowl: "The size or diameter of the diffuser determines how much surface area of the head will be covered," Hardges says. "The cup size of the diffuser is an indicator of how much hair it can hold while drying." In other words, the longer your hair, the bigger, wider, or deeper the bowl you'll need.
Determine how much airflow you need
The holes or vents in the bowl of a hair diffuser control how much air will flow through the device. "The airflow is determined by the placement and number of holes on the diffuser, which determines how quickly your hair dries," says Hardges. If your hair is very thick and slow to dry, you'll want a diffuser with a high number of holes and vents, while thinner hair may do better with fewer holes or customizable vents.
Consider the prong length
For long and/or dense curls, look for a diffuser with longer prongs, which will help you better dry your scalp and also keep your curls clumped while sitting in the diffuser bowl. For shorter or thinner hair, you can get away with a diffuser that has short or nubby prongs.
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