Done both, with without, more often in my youth without, and I believe in any rider's right to thumb their noses at the fates, but these days I put the cap on because I ride in a fashion that might endanger my skull if I should have just the slightest mis-step with congestion the way it is. When I'm in the sticks and have to run to the store, I might, one out of ten, take a quick trip with out the full face, but even when I do that I feel slightly guilty. More often than not when that happens it's 110 degrees outside. That being said, we all represent responsible riding to those who see us on the road. And wouldn't we want the little ones in the back seat of a neighboring car to be ingrained with the concept that anyone who rides a motorcycle wears protective gear so that they are inspired to do the same should they become riders in the future? And a final note: for those of us over 40, and of any age, think about wrinkles, baby. The more the wind blows the skin, the older we get. Cheers!