Thanks for your interest! (and possible order, we had about 6 go out to Virginia already this morning not sure if you ordered)
The top plate itself has a concave shape to it that assists in drying wet helmets. Here in Michigan we have been stuck in several rain storms, my personal gear has been soaked and seems to dry out fairly quickly inside. We are toying with some ideas with r&d to put some notches in the plate, if the prototype tests well it will be put into production.