Our iconic Lancôme Cils Booster XL returns with new luxurious packaging. A white, lash-enhancing mascara primer base, suitable for sensitive eyes, enriched with fibers and helps to protect your lashes and gain a lash boosting effect. Use Cils Booster XL eyelash primer under your usual mascara to enhance its results for a look that is intense and captivating. The Cils Booster XL formula helps to leave eyelashes looking longer, curvier and thicker without smudging.