There is a rumor floating around that the newest batch of T-Formex will be a bit thinner and lighter than what has been produced so far.
That would be the same as Royalite or R84 the thinner and lighter version of Royalex. The problem with this is that these lighter version are much more susceptible to cracking. The last thing you need for rocky class III rivers. The only positive is that they can weigh 8 - 10lbs less and for the maker a slightly lower cost of raw materials and maybe a bit less time in the "oven". All my Royalite boats have developed serious cracks.