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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Whether you are scaling a granite monolith in Yosemite or practicing your lead falls at the local crag, your safety gear is your lifeline. Among the most critical pieces of equipment is the climbing helmet. While many climbers focus on the strength of their ropes or the friction of their shoes, the fit of your head protection can be the difference between a minor headache and a life-altering injury.
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A poorly fitted helmet can ruin a great day on the crag. Worse, it can compromise your safety during an unexpected fall or rockfall. Your headgear needs to sit snugly and securely to do its job properly.
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