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

Every cyclist knows that a good bike helmet is essential for safety on the road or trail. But what many riders don't realize is that even the highest-quality helmet won't protect you forever. Understanding when to replace your helmet could literally save your life.

Cycling is one of America's most popular forms of transportation and recreation, with over 47 million people riding bikes regularly. Yet confusion surrounds one critical safety question: are bike helmets legally required? The answer depends entirely on where you live, your age, and sometimes even where you're riding.

Rock climbing and mountaineering push the boundaries of human endurance and courage. Yet even the most skilled climbers face unavoidable risks from falling rocks, equipment failure, and unexpected falls. While climbing helmets cannot eliminate every danger, they serve as your primary defense against head injuries that could end your climbing career—or worse.