The single wall tapers out to the bottom, has 50mm Velcro to connect to the awning. At 50mm the connection is very strong and wind is unlikely to detach it.
 
4 x walls will make a full kit for the Extreme 270 and connects to each other via 50mm Velcro 
 
3 x Walls for a full kit on the Extreme 180
 
The single walls can also be used for the Extreme Darkness but if you are after a wall kit please check out the Extreme Darkness Wall Kit
 
Extreme Darkness Awning Wall Kit – Bushwakka NZ
 
Measurements for a single wall in images