Most Impact Instant Canopies, Pop Up Shelters and Folding Tents are used in combination with Canopy Sidewalls. Impact Instant Canopy Universal Full Enclosure Canopy Sidewalls feature 500 denier polyester fabric construction, full length color matched side zippers for joining multiple walls together, Velcro height adjustment frame straps, side Velcro secure straps for individual wall set ups and bottom wall ground security “D” Rings.