The nose is almost close to the mask and the noise is very solid. Also there is a obviously flaw on the new mask. I don’t know why but it was there just like a skin was take off at mask inside around 3x2 cm. Can I request any post service ?
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A.为获得头盔的适用尺寸,请将卷尺在耳上约 1 cm 处,围绕头部最宽处一圈。
将所得测量值对照尺寸表。