The newly bought helmet has no label.

If the newly bought helmet has no tag, you can follow the following steps:

1. Communicate with the merchant: First, you can contact the helmet merchant and ask if there is a tag and ask them to provide it. If the merchant does not provide the label, you can ask them to return or exchange it.

2. Check the quality: You can check the quality of the helmet to see if there are other signs, such as the date of production and the manufacturer. If the helmet quality meets the requirements, you can choose to continue to use it.

3. Ask for help: If the merchant can't provide the tag or you have questions about the quality of the helmet, you can ask for help from relevant institutions, such as consumer associations or quality supervision departments. They can help you identify the quality of your helmet and provide you with relevant legal protection.

In short, if the newly bought helmet has no tag, you should communicate with the merchant in time and follow the above steps.