When cold and warm temperatures converge, water vapor converts to water droplets. Water with no place to go collects on surfaces, like the inner pane of a skylight, and ruins the aesthetic the product was purchased to enhance. Our unique snap-lock PVC inner frame acts as a thermal break to prevent condensation from occurring in the first place, but if it does it will be captured and released within our gutter system through the weep holes we create in all four corners.