* Compression: Beanies compress the hair against the scalp. This pressure can temporarily flatten the hair shaft, especially if the hair is damp or freshly styled.
* Reduced Volume: By pressing the hair down, beanies reduce volume and lift. This can give the illusion of straighter hair, as it minimizes curls or waves.
* Friction: The friction between the beanie and the hair can sometimes smooth down the hair cuticles, contributing to a slightly straighter or less frizzy appearance.
* Hair Type: The impact of a beanie on hair texture varies depending on the hair type. Fine, straight, or slightly wavy hair is more likely to appear straighter after wearing a beanie compared to thick, curly, or kinky hair. Curly or kinky hair might just experience flattened curls.
* Time: The longer you wear a beanie, the more pronounced the flattening effect might be.
In Summary:
Beanies don't straighten hair in the way that heat styling or chemical treatments do. The effect is temporary and mainly due to compression and reduced volume. Once the beanie is removed, the hair will usually revert to its natural texture, although it might retain some of the flattened shape temporarily.