Is Irish Curls a Real Hair Type? Stylists Break Down the Science and Myths

Is is Irish Curls a Real Hair Type? Stylists Break Down the Science and Myths a question on your mind? Find out expert analysis right here.

Human hair does not emerge from uniform molds. In clinical trichology, the shape of the follicle determines the geometry of the hair shaft. A perfectly circular follicle produces a straight cylinder of hair, while an asymmetrical, oval, or hooked follicle yields an elliptical strand that twists as it grows, forming a wave, curl, or coil.

Scalps rarely feature identical follicles from ear to ear. Genetic expression can shift across different zones of the head, creating mixed texture hair on a single individual. The hair at the nape frequently grows from more elliptical follicles, while the crown produces rounder shafts.

Environmental exposure deepens this contrast:

• The outer layer (the canopy) absorbs direct sunlight, UV rays, hard water minerals, friction from hats, and heat from hot tools.
• This constant friction strips the outer cuticle, stretching the wave pattern flat and creating high hair porosity.
• The underlayer remains shielded from solar radiation and mechanical abrasion, maintaining its natural lipid barrier and preserving its hidden curl pattern.

The result is not two competing genetic codes fighting for dominance, but a natural gradient of follicle shapes exacerbated by daily weather exposure and heat styling.