I like the helmet, screen ,ear muff combination helmets. I have 3. I like the Husqvarna technical forestry helmet best. Lightest and most comfortable.
I had to look twice at the author of the post after you said "tractor running over them"....I thought it was LodgedTree, but then again he only destroys chainsaws and other expensive equipment.
The screen can come on and off but I think the visor part is molded in. It is not very big though so I don't even notice it.