I just got the Osmo 3 days ago for vlogging. On my first day, I noticed that my hands were getting uncomfortably sweaty and was complaining about it. My wife had a solution and took the Osmo Mobile with her to the leather workshop.
My hands are still sweaty, but the leather is good at wicking away the moisture. I am no longer worried that my hand perspiration is going to soak into the Osmo handle.