This is one special card I created specifically for my son. Unfortunately it will probably arrive a little late. This is my first trifold card and it is nowhere near as complicated as it looks.
All you need to do is cut a 6 x 12" piece of paper and score it on both short ends at 2 and 4". Then, using a paper trimmer, cut lengthwise app. 1 1/2" from the rim between the 2" and 10" score mark. Don't overshoot these points, otherwise the card will not fold neatly.
When top and bottom of the card have slits in them start folding the three sections so they fold opposite from each other. When done, you should see a figure 8 when looking down onto the card. Decorate the many individual panels, make an envelope for the card, done. The card folds flat for mailing.
This is a fun card to make, let your imagination run wild!