White Canopy Extension Kit, Fits 1-3/8" Frame 10 x 20. Expand or add a sidewall to your canopy using our canopy extension/sidewall kit. This accessory will fit the 1-3/8" frame. You may quickly convert your 10' x 20' max ap canopy or 18' x 20' super max canopy to a fully covered event tent or single or double sidewall windbreak. It is made of the same triple-layer, rip-stop, woven polyethylene fabric material as our popular canopy. The 50+upf rating blocks more than 98% of uv harmful rays. The upf represents ultraviolet protection factor and indicates how much of the sun's radiation is absorbed. The 50+upf is the highest fabric rating for radiation exposure. There are only 2% of the uv rays that will penetrate through the shade fabric. It has a uv-treated inside and out. The heat-sealed seams not stitched for a stronger bond and absolute water resistance. You maytake out the poles and the panels can act as a wind or sun barrier.It is easy-to-install pre-fit wall panels go up fast with bungee fasteners and includes all-steel panel poles, rope tie-downs and temporary anchors.