Canari has some mos' excellent wool jerseys in their lineup this summer.
thin, lightweight, wick well and no-itch. feel like cotton, 65-70 bucks retail. AND high vis colors.
this will sound odd only to those that haven't worn the modern summerweight wool clothing yet, but I pull on a lightweight Smartwool T-shirt or these Canari jerseys, and they actually have a COOLING effect.
order from your local shop that carries Canari jerseys if they don't stock the wool ones.