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Much like the safety belt on cars, the pin of the chin strap can be stretched freely in order that the chin strap suits people with different facial contours. Thus, there is no need to adjust the chin strap when the helmet is used by different people, making the helmet more convenient and safe for use.
youtube:
http://youtu.be/HKRg027VlQQ
Tunghai University
Taichung, Taiwan
Tunghai University
Taichung, Taiwan
Shih-Sheng Chen
Iu-Ru Lai
