These sidewalls are made of durable 240G blue polyester fabric and, when two packages are used, fully enclose your canopy to create a great protected interior space in your canopy. You can easily get in and out thanks to the zippered access, but bugs, rain, and all that other stuff you don't want to deal with can't. You don't need anyone to tell you that wind, rain, and annoying bugs can be your worst enemy when planning an outdoor event. Similarly, you don't need anyone to let you know that saving money beats spending a ton. You can do both simply and effectively with this 4-pack of side walls for your 10 x 10 Sport Canopy. It's the simplest, most cost-effective way to add privacy and protection from the elements to any gathering.