Which type of hair is less likely to frizz in humid conditions?

Straight hair is less likely to frizz in humid conditions due to its structure and characteristics. Frizz occurs when hair absorbs moisture from the air, causing the cuticle (the outer layer of hair) to lift and result in a rough texture. Straight hair typically has a smoother cuticle layer, which allows moisture to sit on the surface rather than permeate the hair shaft.

Additionally, straight hair often has a more uniform texture and lay flat against the scalp, minimizing the likelihood of frizz as there are fewer raised cuticles that can catch humidity. While coarse hair may resist frizz more than finer textures, it still has a higher tendency to become frizzy in humidity compared to straight hair, as it can have a rougher surface that interacts more with moisture. This makes straight hair the best option when considering resistance to frizz in humid conditions.