What is a disadvantage of human hair related to its reaction to?

Human hair's reaction to humidity is a significant disadvantage because it tends to absorb moisture from the air, leading to changes in texture and style. When human hair becomes humid, it can swell, lose its shape, and become frizzy or difficult to manage. This is particularly relevant in environments with high humidity, where maintaining a desired hairstyle can be challenging. In contrast, synthetic hair typically does not have the same level of moisture absorption, making it less prone to alterations in style due to environmental factors. Understanding how human hair reacts to humidity is crucial for proper care and styling techniques.