Pro-Tec Classic Certified Skate Helmet Small size professional quality classic helmet for action sports; fits head 21.3-22.0 inches (54-56cm) Outer ABS shell and inner EPS foam liner protect against hard, fast falls and high-impact slams Plush moisture wicking liner and fabric prevents dripping sweat, allowing wearer to stay drier and focus 11 large vents improve flow-through air channeling to keep the wearer cool during intense action sports Loved by skaters through 40 years of pioneering design and Certified by independent scientific tests and safety standards