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2. Motorcycle helmet - Wikipedia

   en.wikipedia.org/wiki/Motorcycle_helmet

   The Snell Memorial Foundation recently certified a flip-up helmet for the first time. [ 17 ] [ 18 ] ECE 22.05 allows certification of modular helmets with or without chin bar tests, distinguished by -P (protective lower face cover) and -NP (non-protective) suffixes to the certification number, [ 19 ] and additional warning text for non ...