From the manufacturer:
Gorgeous, glamorous lashes that stay picture-perfect, even through inclement weather and a few tears, are now yours. This must-have mascara that extends your lashes up to 60% instantly, now does it with a long-wearing, waterproof formula that won’t smudge or budge. Lancôme’s exclusive Fibrestretch technology turns the tiniest, finest lashes from barely-there to infinite lengths. And the patented Extreme Lash brush attaches supple fibers to every eyelash for an instant lash extension effect that’s utterly unforgettable. Ophthalmologist Tested.
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