YSL Top Secrets Instant Matte Pore Refiner YSL Top Secrets Instant Matte Pore Refiner is a lightweight, oil-free, white cream primer designed to instantly mattify skin, blur pores, and reduce shine for a flawless, smooth finish. It uses salicylic acid and walnut leaf extract to manage oil and improve skin texture over time, serving as an ideal base for makeup or for on-the-go touch-ups. Authentic!! NIB Travel Size 5ml/0.16oz (A fabulous way to try something new or for travel.)