How does humidity affect hair?

Humidity has a significant impact on hair due to the way moisture in the air interacts with hair strands. When the air is humid, the increased moisture levels cause the hair shaft to absorb water. This absorption can lead to the cuticle, which is the outer layer of the hair, to swell and lift, resulting in a rough texture. Consequently, the hair becomes more prone to frizz as the strands expand and separate, losing any previously styled shape in the process.

This frizz is often accompanied by a lack of control in styling, making it difficult to maintain a smooth look. Instead of remaining sleek and styled, the hair can puff out or become unkempt, especially in styles designed for straight or controlled hair. Therefore, the impact of humidity is most evident as it disrupts the intended style, making it harder to manage and maintain.