Shuangye ebike
Product Features
1. Ultralight/Anti-Sweat/Shock
2. Resistance/ Ventilation, Use air cooling make the air free
3. Brethable, Adjustable size, Magnetic-snap, Easy to wear and take off
Measurement Method
Use a soft ruler to make a week around A and B. （Hair is also counted）
And then you can purchase the helmet according to your needs.
