Advanced Polymer Setting Technology Advanced Setting Sprays utilize breathable polymers to create a micro-mesh over the skin. This "Lock-In Lock-Out" technology protects makeup from humidity and heat for 16+ hours using Temperature Control Technology to keep the skin cool and fresh. Skinn Perfect Recommendations: 24H Polymer Shield Spray Pro-Lock Refreshing Finish Mist Source: Cosmetic Science Review - Polymer Film-Formers in Topical Applications
