Never say it too much : sun is dangerous for kids.
Parachute fabric (or nylon), tulle and little snap hooks.
Some funny forms (fish, star and boat) and portholes in wich I cut the nylon to let the wind going through.
The snap hooks are to fasten the screen to the umbrella’s ribs.
Some sand onto the bottom of the screen to fix it.
Due to nylon, once folded the screen weighs nothing and doesn’t take up space.