Ultra Max Canopy Replacement Cover Only(30x50) RIP STOP TOUGH - 6.5 oz./m triple layer woven polyethylene fabric material. HEAT SEALED SEAMS - not stitched for a stronger bond and 100% water resistance. UV-TREATED - inside, outside and in between with added UV protection, fade blockers, anti-aging, anti-yellowing and anti-microbial agents. RATCHET TITE TENSIONING - ensures optimal cover to frame fit. EASY TO INSTALL- cover goes up fast and remains secure with bungee fasteners.