I have been collecting crash reports and photos of crashed gear and resultant injuries for 3 years now, specifically on the subject of mesh and textile gear. I note the reasons for the crash, brands, pics of crashed gear, injuries and references where possible. You can read my docs and make up your own mind if mesh is crap. We live in an imperfect world and each crash is a little difference. Your results may vary.
Does Motorcycle Mesh Gear Melt in a Crash?
If anyone has crashed in mesh or textile and would like to contribute their experiences, both good and bad, and photos please let me know.
Leather is best but I would faint in 30C heat and crash anyway. Beside getting mushed by a car, there are also environmental and road factors. I use mesh above 25C. I will trade off some abrasion resistance for a lower core body temperature. If you can ride comfortably in leather in 30C heat and humidity then do it. I tried and found it unsafe.