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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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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You are standing at the base of a frozen waterfall, axes in hand, ready to ascend. You reach for your helmet, but pause. Is the helmet you used for sport climbing last summer actually safe for the shards of ice about to rain down on you? It is a common dilemma for outdoor enthusiasts transitioning between seasons.
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