Hi,
From direct experience, Daytona boots from Germany. Their gore tex leather boots, when treated with the Daytona polish, (very chemical smelly, but they must know it works) don't even get damp, (i.e. the leather is totally unaffected) after an hour of high speed riding in torrential rain. Never known anything to match these, except the Rukka textile gear.
Not wanting to sound like an advertisement but rather to share the experience.