The GREEN WING®trailer skirt features our exclusive heavy-duty hem, which improves impact protection and reduces the fairing’s EXCLUSIVE HEAVY DUTY HEM weight by more than 10%. About Green WinG®& ridGe CorPorAtion Ridge Corporation is an innovative company using the most advanced technologies available to produce lining systems for the trailer and truck body industries. The simplistic design, lightweight materials, and patented V-Brace technology make for a quick and easy install. Green Wing's are the only trailer fairings that come delivered pre-drilled. GREEN WING®– aerodynamic fairings are designed to provide the highest fuel economy at the lowest cost per mile. Green Wing® Side Skirts will install normally on refrigerated trailers.