Strong - heavy duty steel frame with premium powder coat finish resists chipping, peeling, rust and corrosion. Durable - rip stop tough triple layer woven polyethylene fabric material for lasting protection from the elements. Sun protection - treated inside, outside and in between with added UV protection, fade blockers, anti-aging, anti-yellowing and anti-microbial agents. Simple cover tightening - patented twist-tight tensioning feature squares up frames and tightens down covers for a clean and finished look. Easy assembly- quick and easy set up of the steel frame with built in slip fit wedged tubing. Stability- the wide foot plates on every leg add stability/easy anchor points