Breaking Down Eyelash Extenension Anatomy: 2D, Y, YY, YYY, U YY & Fox YY Explained

In the lash industry, the terminology for different extension types can be confusing, especially with new split-stem designs constantly entering the market. Lash techs often ask: What’s the difference between 2D, Y, YY, YYY, U YY, and Fox YY eyelash extensions?

Each style has a unique structure, application & effect on the eyes. Some are more natural, others more dramatic, and some are designed specifically for certain effects. In this guide, we’ll break down the anatomy of each extension type.

As lash artists, it’s important to educate clients & stay educated. Understanding lash anatomy is what separates true professionals from beginners.