It claims to have lengthening fibres, which I strongly believe. When you pull the wand out, you can actually see them. Transferred to the lashes, I only needed two modest coats to make my lashes look incredible. Curled, defined, volumised, and most of all, long (unfortunately I suffer from a particularly stubby lash). I did worry about fall-out or flaking off throughout the day what with these cheeky little fibres hiding out in there but nope, they stayed perfectly in place throughout the day!
On top of that, the packaging is cute, and the price is a bargain right now in Boots...all in all, I will re-purchase this forever and ever. Result.