It's almost always over 100 here in the summer & I haven't found any shop that carries anything worth wearing more than 15 minutes in the glaring sun. I have heard that Vanson makes a great summer mesh jacket with armor in a choice of grey or black, but no one near me carries them. I wear summer mesh 1st Gear gloves & my regular shirt under a long-sleeved Hi-Viz Walls work shirt. It is made of polyester mesh and is Hi-Viz yellow with multiple reflective bands & it really makes people see me day or night. The air passes thru it & it doesn't hold smells. It doesn't offer a lot of protection, but its better than nothing & people see me from a mile away. Yeah, I look like a garbage collector in it, but it works for me no matter how "uncool" it looks. Here is the link and a photo of it: http://www.walls.com/walls-importer/images/56362.jpg