La Roche Posay Anthelios XL Ultra-Light Fluid 2017 BOGOF: La Roche Posay Anthelios XL Ultra-Light Fluid 2017 BOGOF refers to a specific sunscreen product from the Anthelios XL range by La Roche Posay. The description suggests that it is an ultra-light fluid formulation designed to provide high . "BOGOF" stands for "Buy One, Get One Free," indicating a promotional offer where customers can receive two products for the price of one.