The XFL allows players to wear tinted and decorated visors. Mountain troops wore distinctive stiff field caps with semi-rigid visors and ear flaps. Aftermarket exterior sun visors are available for trucks as cab visors. There are many helmets surviving with 'grotesque' visors. The premium package includes a different tailgate spoiler, running board, and door visors. The first football visors were made by Oakley. They also came with optional lights on the visors. Rules regarding visors and face masks are mildly controversial at professional levels. His views of hockey have him campaigning for all players to wear partial visors. Senior police officers may wear fretting ("scrambled eggs") on their hat visors. Padding on the sun visors became popular for the extra protection afforded to passengers. Chief petty officer and junior commissioned officer visors are shiny black plastic without ornamentation. In one suggested protocol, chimpanzees are given first-hand experience of wearing two mirrored visors. The visors themselves are of markedly different colours or shapes. The NHL "strongly recommends" the use of visors.