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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You are packing your gear for a weekend at the crag, and then you look over at your work bag for Monday morning. It creates a tempting scenario. Why buy two separate pieces of safety equipment when one sturdy shell seems like it could do both jobs? After all, a helmet is just a plastic bucket designed to protect your head, right?
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Standing at the base of a cliff, staring up at a multi-pitch route, the last thing you want to worry about is your gear. You check your knot, double-back your harness, and count your quickdraws. But what about the piece of gear protecting your most vital asset?
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