I lived in the Phoenix area until we moved to N. Cal. a little over a year ago, so I understand the heat with which you are faced. Anyway, my hubby bought the Solumbra jersey, and while it does a good job blocking the sun, it is not moisture wicking (sp?) and he ended up soaked after our ride here in N. Cal. with temps only in the upper 70's. Bleh. I love my Boure jersey and we'll be getting one for DH as soon as he lets me measure him!