Single Shade
A single roller shade is a common shading system, using a single roll/piece of fabric.
Complete Blackout Shade
A complete blackout roller shade system uses a blackout fabric (an opaque fabric where no light can penetrate through the material) and blackout hardware components including side channels and headbox to completely blackout all light.
Dual Shade
A dual shade offers two coordinating fabrics in the one shading system. The benefit is to alternate between a sun screen fabric and a blackout fabric.
A sun screen fabric allows natural light and outlook with the added benefit of heat reduction, UV and glare control. The blackout fabric is a colour coordinating opaque blackout fabric for room darkening.