Totally makes me rethink my JR Phoenix mesh jacket & FG mesh pants. Explains quite a bit about some of the experiences I've had (plenty of hydration but felt like crap after 2-3 hours in the blast furnace). For my daily commutes (temps from 110 to 120 are normal here), the mesh is okay but for my longer trips, I may want to wear my perforated leathers.
Gotta try those electrolyte capsules too. Never heard of those before.