Space age NASA developed foam...
great for insulating to -130'C, buoyancy being the least dense solid in existence and able to withstand great impact such as a blast from a 1KG of Dynamite, this is what Kitesurfing needs...
Yes,if you inflate your kite with Helium,you will boost HUGE !
Unbelievable height,unbelievable hangtime !!
Try it,its insane man !
Here is a video of a kite filled with Helium! The guy gets some serious air time !