MUA Pro Base Hydrating Hyaluronic Primer for Flawless Makeup Prep: Gel Texture with Hyaluronic Acid for Smooth Hydration. The MUA Pro Base Hydrating Hyaluronic Primer is a lightweight gel primer infused with hyaluronic acid, delivering hydration and a smooth finish to the skin. It creates the perfect base for even makeup application, while spreading easily without leaving a sticky residue. Ideal for Daily Use & All Skin Types. Apply after your skincare routine or before foundation, and use throughout the day for an extra boost of freshness. 100% VEGAN & CRUELTY FREE.