Wow, nice professional vid, just got back from a lower canyon motorized trip. Not that I didn't pack 'ok' (took too much stuff of course), but, if I would have seen your video it would have made me better prepared. I feel like developing a 'rainsuit' that would have many features of a wetsuit. Having a 4 foot wall of water dump on you, is very different than strolling around in a rainsuit out of the canyon..
+david barker Thanks David! Yes, when using rainsuits under huge waves it's quite a different experience than your standard rainstorm! We're considering the addition of a splash jacket (generally used by kayakers), especially for cooler trips. We look forward to seeing you again soon!
Real paddling gear, the stuff whitewater paddlers use, is the way to go. IMO even inexpensive paddling gear is better than rain gear. NRS is a good source.