Just a little tip that I have tested and had great results. Doing track days in Oklahoma is hot during summer. I'm old at 44 and the heat was really getting to me. Soooo I had the idea to insert a soft gel freezer pack under my leathers in the chest,stomach area. I used the ones that measure about 10" x 18". I would have a couple of extras in my cooler of ice and rotate them with my track sessions. Just like any gear once you are on the track you don't even notice it's there. My leathers are perforated and when the wind goes thru them and with the freezer pack, it's perfect.