Single Top Bar
Having just one central bar atop this polytunnel protects it from collapse due to water build-up.In other polytunnels, having two bars running then length of the polytunnel means that rainwater can pool between them, putting a lot of weight on the structure of the polytunnel, this can potentially lead to the collapse of a polytunnel.
Sloped Sides for Wind Protection
Polytunnels with vertical walls are much more prone to wind damage. By having sloped sides, the shape of this polytunnel is designed to deflect the wind upwards, diverting some of the strength of the wind away from the side of the polytunnel.