Engineered from engineering grade PC material, this lens base delivers a durable construction that withstands impacts while maintaining featherlight comfort through optimized weight distribution. Ideal for adventure motorcyclists who switch lenses during expeditions or commuters seeking allday helmet functionality. Performs flawlessly during aggressive cornering on mountain roads or prolonged highway cruising, with vibrationresistant locking mechanisms that resist slippage even at speeds over 70. Engineered for seamless compatibility with T271 helmets, this lens base features a tool quick release design for instant installation and secure antishock performance during speed rides. Use scenarios: Adventure rides requiring quick lens changes on the go during expeditions. Daily urban or suburban commuting where allday helmet comfort and reliability are essential. Mountain road or long highway riding that benefits from stable locking and antishock protection at speeds.