How does humidity affect hair structure?

Humidity affects hair structure by causing the hair shaft to absorb moisture from the air, leading to swelling and changes in texture. This can result in frizz as the hair cuticles lift, disrupting the smooth surface. Additionally, high humidity can weaken the hydrogen bonds in hair, making it more prone to damage and altering its overall style and manageability. Consequently, individuals with curly or wavy hair often experience more pronounced changes in their hair's appearance and behavior in humid conditions.