Pro-Tec Bucky Helmet Pro-Tec Bucky Helmet Description: Pro-Tec took the original 1970's full-cut helmet and trimmed the ear covers off to create a helmet with style and flair. ProTec Classic Bucky BMX Helmet! Only available with the soft 2-stage foam liners that everyone loves for the comfort and lightweight feel. HDPE is made up of a form-fitting, high-density, polyethylene shell, with flexibility to fit a broader range of head shapes. These are NOT certified to ASTM, CPSC or CE Safety Standards. NOTE: This helmet is NOT CPSC (Consumer Product Safety Commission) certified.. While not as safe as a CPSC certified helmet, the benefit is it allows the helmet to fit certain head types better. While we strongly recommend a fully CPSC certified helmet, a non-certified helmet is certainly better than nothing. Features: Not CPSC Certified. Not for street use. High-impact ABS shell. Nylex lamination on the 2-stage foam liner for added comfort. 11 open vents for excellent airflow. Approx. Sizing: Small: (21.3 - 22 in)