English 
Usually, the shell of the helmet is made of high-strength materials, such as metal, engineering plastics, Kevlar fiber, etc., through its deformation to absorb most of the impact; the lining material has the ability to absorb sweat, keep warm, and absorb shock. Military helmets often have the functi
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Cycling offers freedom, fitness, and fun—but only when you're properly protected. A bike helmet can reduce your risk of head injury by up to 85%, yet many riders either skip wearing one entirely or wear it incorrectly. The difference between a helmet that protects and one that fails often comes down to proper fit and positioning.
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A bicycle helmet is the single most important piece of safety gear a cyclist can own. But its ability to protect you is almost entirely dependent on one critical factor: fit. A poorly fitting helmet is like a seatbelt that’s not buckled—it offers a false sense of security with drastically reduced effectiveness.
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