I have a triple aught design boonie and like it pretty well.  One thing that helps me is to pick up a fishing neck gator as well as the hat - that really helps keep the sun off the back of your neck. 
Not sure how it would do in warmer weather, but I also have an OR Seattle Sombro that I like and I think they have a bunch of other options as well.
 Not sure how it would do in warmer weather, but I also have an OR Seattle Sombro that I like and I think they have a bunch of other options as well.
 
	 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
	 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		