FilStar offers you an umbrella with a wall that can be placed and removed. The wall has two windows. Attaches to the umbrella by a zipper.
When the umbrella and the wall are coupled, the structure becomes an open tent. And when you want air to circulate all around you, just remove the wall, unfasten the the zipper and have a great umbrella that will protect you from UV rays.
The diameter of the umbrella is 2.20 m.