A hair dryer cap, also known as a bonnet hair dryer, is a heated appliance used to dry hair quickly and efficiently. It consists of a flexible, dome-shaped cap that fits over the head, with a heating element inside that circulates warm air to dry the hair.
Hair dryer caps are a convenient and time-saving alternative to air-drying or using a handheld hair dryer. They distribute heat evenly, reducing the risk of hair damage, and can be used to create a variety of hairstyles, from sleek blowouts to voluminous curls. The invention of the hair dryer cap in the mid-20th century revolutionized home hair care, making it easier and faster to achieve salon-quality results at home.