It means the helmet belongs to whoever wears no. 31 jersey. Every player has their jersey no. on their helmet. The helmet is made to fit that player only so it garantees the helmet will fit
Rawlings NRG Football Helmet
He wears a hockey helmet
Sachin Tendulkar wears SM helmet . He wears Helmet that comprises of an adjuster, his helmet shows SM at its back and Play On! on the sides of its grill. The helmet is exclusively manufactured by SM and is of VIGOUR Quality. To have a clear picture, log on to WWW.SMCRICKET.COM and view the Product Catalogue.
Justin Tuck - DE for the NYG wears a XXXL
The Roman soldier wore his helmet for the same reason an NFL player wears his---head protection. The helmet was designed to protect the head, neck and face of a soldier.
Michael Jordan and A.C. Green