If it’s positively pouring, I’ll be soaked through and through anyhow and I use belgian booties - thick socks. Sure, Water gets in no problem, but at least it also gets out at some point if the rain stops. Once my arse is soaked, I might as well have soaked shoes.
However, if the rain isn’t biblical and I stand a chance of shielding myself, Assos rainBooties do the trick very well. My skinny calves required some tightening around the top, but they do an excellent job without overheating me.
I’ve never known a more high-techy and overengineered product than an Assos garment
It’s their own fabric, but it works similar to gore-tex I assume. Waterproof breathable stretch membrane that looks like a stripper’s boot, silicone seal at the ankle, more wind- and wear-resistant fabric at the toes. As I said, they seem to be doing a terrific job at keeping water at bay when I wear them.