Bare Escentuals Prime Time Oil Control is a water-based primer developed for oily, sensitive, or problem-prone skin to instantly smooth the complexion prior to bareMinerals SPF 15 Foundation. The oil-, fragrance-, and siliconefree formula is clinically proven to control shine throughout the day, as well as to regulate oil and refine pores with minerals and natural plant extracts. The lightweight primer glides on seamlesslyleaving the skin matte, refreshed, and ready for foundation.