Y Lash® Eyelash Extensions are semi-permanent individual eyelashes that lengthen and add fullness to your natural lashes. One Eyelash Extension is applied at a time directly on to your natural eyelash in a specific sequence (1D technique) to create natural, classic and elegant look. Each Y Lash® eyelash is crafted from the highest synthetic polyester, then shaped and curved to replicate a natural eyelash. They are light, comfortable and respond better to wear and tear than any other materials. In addition, synthetics have the least chance of allergic reactions with human skin and eyes.