We just added an new blackout shade called the SlumberShade. This cell shade runs up and down on an easy to install track. The rails have a backing to block all light seepage. The top has this fuzz material that sucks to the top were no light will penetrate there. The material is a made of a heavy duty cellular material with a unique metal miler interior that allows not penetration. This is actually endorsed by the National Sleep Foundation. We simply call it the ultimate blackout shade. It does the job.