An essential component of any skin care regimen, SPF (sun protection factor) measures the level of protection against UVB rays, and its number correlates with how long you can stay in the sun without burning. Regardless of your skin type or tone, using SPF products year-round is an ideal way to prevent premature aging, sunburn and some forms of skin cancer. From powders to primers, Clinique Skins' wide range of SPF products are sure to meet your needs.