The vehicle's body structure has been strengthened with added stiffness, helping to enhance its handling response while reducing engine and road noise in the cabin. (theintelligentdriver.com)
If your rolled fabric isn't behaving, you could even roll your fabric around a lightweight dowel or cafe rod for added stiffness. (theinspiredroom.net)
Wooden stringers help to add stiffness without upping the weight. (geekwrapped.com)