Review on Radians SV7OL Surveyor Saftey Orange by Chad Chavez

I bought this vest to use in the hotter summer months but found it surprisingly hot for such a light material, especially as the whole back panel is ventilated. My heavier 100% cotton winter vest is only slightly warmer than this one. The design is great with the vented back panel, pockets etc, but the material is too hot. It must probably have been made of cotton, or more often a cotton blend.