You spend a good 30 minutes perfecting that dewy, glass-skin base. You set it, you lock it in, and you step out into the world feeling invincible. Fast forward to 2 PM. You catch a glimpse of yourself in your phone screen and... disaster. Your foundation has completely abandoned ship. It’s pooling around your nose, sliding off your cheeks, and looking aggressively patchy. Sound familiar? We’ve all been there. It’s incredibly frustrating. But before you go tossing out your expensive concealers, you should know that it isn't your blending skills failing you. It’s not even the makeup itself, really. It’s literally just biology clashing with thermodynamics. When the climate shifts, the way your skin behaves underneath your makeup completely changes. Here is the exact science behind why your base degrades so quickly during these brutal summer months.