The new Pyro Pros have an additional over lay on the knees and bum to add extra durability, this was an intentional upgrade done at the same time we switched up to breathable material. The overlays themselves are not water proof, all they do is add durability. The 1st production run of these suits have seen some suits that are more susceptible than others to this water ingress than others and as a result we a) did not notice this issue ourselves when testing and b) realistically only have a couple “problem” suits that should be addressed.
How to address? As with all subsequent production runs of suits that we are now selling the easiest solution is to introduce a small drain on the knees to allow this water to flow out. Again, this is only for those suits affected by large amounts of water ingress. Simply separate the 2 layers of suit material in the panel in question and use a soldering iron or hot knife tip to melt a small hole at each corner of the overlay. This will solve your problem instantly.
For all other riders with suits that are allowing only small amounts of water into the knee overlay I would suggest simply not doing anything at all. The overlay material will break down a bit over time and become more porous, allowing the water to flush through naturally.
All suits now being sold from more recent POs have these drains already in place.