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As far as the T-Hall is concerned, the guy at the Armada booth at SIA said that it received minor core refinements. He said that the flex pattern was changed a bit in order to move the skis flex point further out towards the tip and tail, and kept the underfoot area rigid. This was done in order to make it a bit more of a "big-air capable ski." In addition, he said the Halo has not changed internally either. I also have news about a 195 JJ if anyone is interested :)
I Believe the flex goes further into the tips to help with boxes and butters as well as being able to stop the 'wobble' or some sort of wavey motion in the air and landing... i may be wrong but this is what i think the flex helps with while maintaining the stiff core.. please correct me if wrong... or clarify