The Sun shade for telescopes with an 88–90 mm diameter is designed for instruments such as the Sky-Watcher Heliostar 76/630 and Acuter Elite Phoenix 80/400 H-alpha solar telescopes, but it also improves viewing comfort with other solar telescopes featuring a similar tube diameter.
It eliminates the need to squint or shield your eyes from disturbing light with your hand, allowing you to focus entirely on observing.