I have sworn off the following materials in my motorcycling wardrobe:
Cotton, wool, vinyl and leather. (except for boots and gloves, and I still think thin, high quality Merlino wool socks can't be beat under any conditions)
Why? Because modern polyester microfiber and aramide variants have rendered them virtually obsolete. They are "old school" and just about completely
useless, especially in hot weather.
My wife and I both use long sleeve form fitting white (polyester) Under Armour shirts and briefs. Unless you have a perfect
body don't even think of being seen in public in this stuff.
Keep your jacket on in public, trust me on this one.
Cooling vests without sleeves or collars (no chafing or binding).
Evaporative cooling neck wraps. (polyester)
Armored BMW Venting Machine (polyamide) jackets and pants. Insanely expensive, but have you priced out a complete skin graft job recently?
Why not Kevlar? It degrades RAPIDLY under exposure to UV radiation and something the manufacturers of Kevlar gear never
KonTour Seats (perforated polyester ultra microfiber) soaked in water. The seat has a waterproofing barrier inside to keep the foam from getting wet.
We've ridden all day long in temperatures well over 100F without ever feeling uncomfortable. Most importantly this setup keeps you from getting
dehydrated. We still drink lots of water, but instead of having to drink every 20 minutes we go an hour with no problem. We're good for about 2 - 3 hours before re-wetting the gear.
The cooling gear gets stored inside
a small heavy duty dry
bag (the kind river rafters use) full of water, ready for duty as the temps soar. Trying to thoroughly soak down the vest and collars with a water bottle by the side of the road is a joke...