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Size:Head Circumference Approx 57-61cm
Swivel head governor with superb feel to easily adjust the circumference of the helmet.
Aerodynamic and ventilation design - multiple big ventilation holes allow air to go through the cycle helmet, helping to keep head cool.
Hinkar Men Women Porous Ventilation Mountain Bicycle Helmet One-Piece Bike Helmet(Yellow) - B07FPLTYLL