purple colored items of the formal style useage

I believe y'all can go ahead and call these things waterproof I'm a volunteer fireman and I've just got home from a call we were on where I was in water for several hours with my fit bit on and the only damage I see is the rubber came loose on the band it was a emergency I dove in the water not even thinking about taking my Fitbit charge 2 off until later on when things slowed down I realized I had it on purple colored items of the formal style useage