First of all, I will determine the selection type, and I will briefly list the three kinds of helmets applicable environment and advantages and disadvantages: half helmet: the preferred half helmet for urban commuting (3/4 helmet), so that you can take it off and put it on so that you can drink water and smoke.The half helmet has one drawback: it does not protect the chin.Full helmet: long distance motorcycle I wear full helmet, full protection of the head, shortcomings: not good take off not good wear not cool not convenient to drink water smoking say.Uncovered helmet: compared with the full helmet, it is a little heavy. Considering all the functions of the half helmet and the full helmet, I think there is a disadvantage: the quality of uncovered buckle affects the safety factor (personal experience of 150 RMB uncovered helmet falling and grinding chin).

    Let me talk about my ideas and requirements of helmet selection. The requirements of helmet selection are: reliable quality, double mirrors, "uncovered helmet" priority over "full helmet" priority over "combination helmet", and good ventilation system.The above conditions are in order of weight to light.When I bought my first helmet, I thought it would be safe to walk at night with a light on it, so I prioritized having a light.Material just began to look at carbon fiber, and then many SHARP evaluation five-star helmet is also ABS will not tangle, when the ABS and ABS are not the same, only less big factory will not be too bad.

    Reliable quality: DOT American standard, do not have to send for inspection, many small factory logo DOT I feel not reliable, big factory can also believe, otherwise only less in line with ECE, if there is snell and sharp is better.Double mirror: this is very useful when facing the sun in the morning and evening and when the sun is strong at noon.Faceless helmet: it's convenient for people who wear glasses, because it avoids many situations of taking off the helmet, such as lifting the mobile phone to the ear to answer the phone, drinking water, eating, smoking, etc. On a long bike ride, which is not as strong as the helmet, but it's worth the convenience.

    Ventilation system: personal reasons, I am more afraid of stuffy, heat does not matter, do not stuffy, otherwise my sweat flow, regardless of spring, summer, autumn and winter.Specific which kind of brand, or big brand, one cent one cent goods, quality has assurance, here I do not recommend.

    The structure of helmet motorcycle helmet according to the use of a total of four kinds, 1/2 of the helmet helmet body protection scope does not include the ear;3/4 helmet body protection extends to ear than 1/2 helmet;The open helmet extends more downward than the sides of the 3/4 helmet. These three types of helmets are called the half helmet.The protection range of the helmet body includes the eye, face and jaw parts, and the shell and jaw protection parts are a whole structure. There are four kinds of helmets respectively.

    In order to verify the important role of helmets in protecting the head in motorcycle accidents, Japan traffic accident analysis center conducted statistical analysis of 280 motorcycle accidents in ibaraki prefecture, Japan in 2001.

    At the time of the accident, more than half of the helmets fell off due to the failure to properly fasten the straps according to the regulations, making the helmets unable to function normally;Of the six cases where the belt was properly fastened but the helmet also fell off, 5 were wearing 1/2 of the cases.

    Head injury without helmet accounted for 67.4%, which was 2.19 times higher than that of wearing helmet. Therefore, the effect of wearing helmet is obvious.In accidents, the proportion of head injury caused by helmet falling off is 1.98 times higher than that caused by helmet not falling off, and the death rate is 4.35 times higher.Therefore, it is important to fasten the buckle properly to prevent the helmet from falling off in the event of an accident.