DOT and CNS Reinforced Certification. Reinforced thick len with superior rigidity. The thickest part is 4mm and the average thickness of normal len is 2 mm. Shield Lock System, make the len more stable in high speed riding. Enhanced Glasses Gap, is more convenient to use and comfortable. Shield Ratchet Plates, increases the adaptation of shell and len and reduces the external noise. 360? EPS full protection, including top, both sides of cheek and chin. EPS built-in space between cheek EPS and for bluetooth headphone, is more comfortable to wear with headphone. Inner sun shield is the sunglasses in helmets, with UV400 protection. Metal Double D-ring, known as the safest buckle, prevents the helmet flying off in accidents. Five pieces removable liners are easy to clean and replace. Made with bamboo material and Coolmax?, increases the efficiency of eliminating moisture and have antimicrobial resistance abilities. DOT certified Single Shield Len, with UV400 protection. Quick-Release Len, easy to replace with bare hand. All six colors available. D.E.V.S. (Dual Exhaust Venting System) , including front venting and back venting, raises ventilation efficiency. Weights without len: Large Shell 1400?50g; Small Shell 1304?50g.