I haven't. I've never had a problem slipping like that before. I'm jumping in and out of my boat all the time too. I think it's just those shoes.<quoted text>Have you thought about putting a non-slip surface on the concrete?
I used to hate them and say I'd never wear them, until my wife bought me a pair. They are quick to just throw on sometimes, but they are known not to be so good when wet, I guess. Really they are dangerous. I'm not one to just fall like that.