Mix and match to fit your lifestyle solution. Walls can be used as a complete enclosure or three walls with an open front or just use one wall to open up front and both sides. This is the best selling lifestyle accessory, fits all 100 SQF 10"x10" popups. (4) WALLS TOTAL About Undercover Our twenty year legacy continues today with the evolution of the World"s first Personal-Shelter® experience. This is what the founders of Undercover® have been doing, evolving the old steel instant canopy to a new generation of durable lightweight design. Undercover® sets itself apart from the competition in two significant ways, high user mobility along with incredible ease-of-operation. The Popup-Shade™ packs advanced aluminum reinforcement technology under-the-hood allowing one-person operation in seconds. Offerings that are 50% lighter than the old school steel models, yet stronger in design and function. * 4 10-ft. zippered P/E walls * CPAI - 84 fire retardant * APEX zippered entrance * Velcro strap roll-up feature * Tie-down attachments * FITS most 100 SQF 10 x 10 frames * Canopy not included