Racther have a boonie then a helmet, we have plenty of choice of many camo's.
A boonie gives you especially in the summer awesome protection against the sun and the incoming bb's.
A boonie has ventilation holes all around so the boonie so there will be enough airflow. With a lace you can put it tight around the chin so it stays in place. These boonies are available in different camouflage patterns so there is always one that fits your loadout.