Stewart recommends getting familiar with a primer or setting spray, both of which can be your best makeup friend while beating the summer heat. “Primer acts like velcro for your foundation, while setting spray locks your foundation in place,” she says. “The right summer primer for your skin type is important! Meaning, if you have oily skin, avoid primers that have too much silicone. This can cause more slipping and moving of your foundation. Instead, try a primer that is water-based or oil-controlling, as this can provide a more stable base and allow the primer to soak into skin rather than floating on top.” Try using MAKE UP FOR EVER’s Step 1: Skin Equalizer Hydrating Primer ($37, sephora.com) and Mist & Fix ($30, sephora.com) to extend the wear of your makeup.