I wear the LG Neo Power (long) shorts year-round. Before that I wore Shebeest Century shorts. I never felt they were a problem on very hot days. The Shebeest Century shorts used to have a mesh panel in the back at the top for added venting, which made me feel a bit cold in lower temps, but I don't know if they still have that feature on the current version.

For me the top I wear is most important on hot days. I like a Sugoi tri-top and DeSoto Cool Wings. Plenty of white airy mesh fabric with this combination.

On very very hot days, I've found I can't wear socks with black cuffs. Even that little bit of black on my ankles adds to my discomfort. Yet I haven't felt a problem with my shorts. Maybe it's because it's so damn hot at that point that I'm not noticing my legs.