You're right. The jacket cuff seals we place our thumbs through are not waterproof, but I rode through a heck of a thunderstorm with a pair of short-guantlet gloves strapped under the jacket cuffs and arms stayed dry. I read some other guys had similar experience with them. But who knows? I know you can't go wrong with a good external gauntlet. And yes, Klim knows all too well their stuff is the best. Be well ma'an.