This little project has been made from some scraps of X Pac VX21 and closed cell foam, and raise the elbow rests by about one inch. The aero bars are a light carbon construction.
X Pac VX21 scraps being sewn into a lift kit for aerobars. The original thin pads are being sewn to the face of the fabric. The two yellow 1/2″ foam pads visible at the top of the image will be inserted into the each pocket. 
Cutting and shaping the four 1/2″ closed cell foam pads. 
The top edge has a double 1/2″ fold. The sides are sewn with a 1/” seam allowance and the bottom corners (will be closest to the rider) are sewn to create a smooth’ish shape. 
Completed 1″ lift-kit. 
Lift-kit installed on a 29’er hardtail with Jones H-Loop bar