What is 3D construction?

From Ocean Rodeo:

What is 3D construction? Why do all of your kites claim to have this? Aren’t all kites 3D?

3D does not describe the third dimension! 3D Construction is an industry first from Ocean Rodeo, introduced in 2003. It has since been copied by a number of other manufacturers in one form or another. 3D describes how we build all of our kites with a Dacron frame. The wingtips, leading edge and trailing edge are all framed in Dacron to provide a Built Tough frame for the kite.