Let’s go #UnderTheMicroscope with #SkinCeuticals Physical Matte UV Defense. Physical Matte UV Defense is formulated with Z-Cote, a microfine zinc oxide physical sunscreen filter that provides broad-spectrum protection from UVA and UVB rays without leaving a white residue. To learn more about this ingredient and this sunscreen, please visit your local SkinCeuticals website. #SkinFact: Physical and mineral filters act like tiny mirrors that reflect the sun's rays.