What is the cuticle layer of hair?

The cuticle layer of hair is indeed known as the tough exterior layer. It comprises overlapping, scale-like cells that protect the inner layers of the hair shaft, particularly the cortex and medulla. This outer layer plays a crucial role in maintaining the integrity and health of the hair, acting as a barrier against environmental damage and chemical treatments.

The cuticle's structure helps to reduce moisture loss and can influence the hair's shine and smoothness. Damage to the cuticle can lead to issues like dryness, frizz, and color fading. Understanding this protective role is essential for hair care practices, as it highlights the importance of using appropriate products and techniques to maintain healthy hair.