I wanted to see how CB leather reacts to BRIEF exposure to water. I put a big drop of water on the band. Waited for 2 min...then wiped off with my shirt. As you can see, there was a very slight mark left behind (2nd pic)...then i use my finger to rub the area...and mark disappeared! So, at least, the CB leather can be exposed to the element briefly (e.g. rain) and be OK.