3DL technology is an adjustment of the fabric at the leading edge of the wing to control the ballooning and the creases that are generated by the curvature in this area. The leading edge is then divided into sub-panels which are sewn into each of the cells at the front of the paraglider. As a result, the leading edge of the wing is perfectly tensioned, which benefits the wing in performance and durability. 

A good comparison is a rugby ball. In order to produce its characteristic oval shape without creases, its cover is made of several panels - not of just one piece. 

The application of this innovation, in conjunction with the 3DP, is key to converting the perfect shape from 2D to 3D.