Mũ bảo hiểm 3 trong 1
Nhiều môn thể thao đòi hỏi người tham gia phải có thiết bị bảo vệ phần đầu, nhưng đó là những chiếc mũ riêng biệt không hoán đổi cho nhau vì chuẩn an toàn khác biệt.
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