YINO American M88 Helmet / MICH Helmet With Special Noctilucent Elastic "Cat Eye" Helmet Band Perimeter: 60cm (in full accordance with the military version sized) Width: 1.5cm (fluorescent film size 1.52.5cm) Material: imported high-elastic Elastic (thickness and elasticity and comparable military version) fluorescent film imports Features: The new military regulations Material cat's eye with the back of two fluorescent light absorbing film 30 minutes can continue to light more than 13 hours at night. Uses: fixed to the helmet above two fluorescent film backwards for the night march behind when the team travels to determine the orientation of the preceding players fluorescent markers while avoiding left behind.