With the AeroBlade Edge Raised Rail Load Bar, it's clear that Thule isn't playing around with the security of roof rack cargo systems. Thule goes so far as to claim that the Box Beam Load Structure makes the AeroBlade the strongest aftermarket bar in the industry. Since we've never had reason to question a roof rack's carrying capacity, though, we're more enthusiastic about the easy attachment interface and fuel-saving WindDiffuser shaping, which acts like a deep aerodynamic rim for your car's roof.