I have tried my fair share of gloves. The absolute best pair was a pair of Technic's that I bought used about 6 years ago and I finally wore them out.
Over that time in anticipation I've tried a few, even stuck them in buckets of water, while some passed that test, they still got wet in a good rain.
Then I rode a SS around lake MI, and a guy I was riding with had a pair of these when the rain kicked up.
Clicky:
https://www.aerostich.com/aerostich-triple-...ain-covers.html
I thought they looked stupid as hell, and I made lots of fun of Tony.
Then my dad got a pair and I made fun of him too.
then we rode in one hell of a frog strangler one day. I had my fancy schmancy Joe Rocket rain gloves that didn't last 10 minutes. We rode in the rain for 2 hours. He was dry, I was not.
So he got me a set for xmas.
Get a one size bigger than you'd think (I wear L gloves but XL in these rain covers).
They go over your good gloves so you don't give up any protection.