IDK why pissing has to do with anything... I take my leathers off in between sessions.
Anyhow, I don't wear leathers w/o underarmor, especially in the summer, mainly because the last thing you wanna do is sweat in your leathers. Also, the underarmor wicks away any sweat. I wear a 3 piece getup. Football style sliding shorts with nice big butt pads, pants and long-sleeve shirt.
Few tricks I've learned over the last 2 years of track riding.
- Always take off your leathers in between sessions (learn how to do this quickly)
- Dunk your underarmor top in a bucket of ice water and then squeeze the water out, before putting it on and getting on your bike. This creates your own refrigeration unit as the hot air enters your suit from the perforations, it passes through the underarmor and when it its your body, it feels great! You don't wanna wear wet underarmor, but damp is totally fine.
Anyhow, living in Los Angeles and riding at some of the hottest tracks around, teaches you some tricks to be more comfortable.