Astronomers are known to be quite finicky when it comes to keeping their telescope's optics clean. This concern is justified as dust is so ubiquitous, keeping your telescope optics entirely free from its accumulation is virtually impossible. However, you don't have to allow your optics to take on dust when you are between observing runs. Proudly manufactured in the USA, Astrozap dust cover material consists of a blend of cotton and nylon. This dust cover features an elastic strap enabling a comfortable, secure fit over the open end of Dobsonian telescopes in order to shield the primary and secondary mirror from dust build-up, producing clearer images.