YY lashes are a type of lash extension that features a split-tip design, with two or four thin lash strands joined at the base to create a "Y" shape. This design provides a hybrid between classic and volume lashes, offering a fuller, more voluminous, and textured look without the weight of traditional volume fans. They are applied individually like classic lashes, making application faster while still achieving a soft, fluffy, and wispy effect.