L'Oréal Paris introduces Double Extension, their first conditioning, extending mascara which respects your lashes & makes them look up to 60% longer!. L'Oréal Paris Double Extension Mascara is a 2 step Mascara which is composed of a conditioning white base coat with Ceramide R which contains natural fibres that act like extensions to visibly lengthen the appearance of your lashes and a lengthening Mascara with a patented brush which evenly distributes intense colour from root to tip, with virtually no clumping.