Blinds that sit over the top of the roof rather than beneath it, stopping solar heat at the outside face of the glass. Because the heat never gets in, the space below stays noticeably cooler than it would with an internal blind doing the same job.

They run the length of the roof and retract when the sun moves off, so you keep the clear sky view for the rest of the year. The most effective shading option for a south or west-facing structure.