FEATURES: Honeycomb Shell Design: Designed to maintain strength while removing overall weight. Helps Mizuno create a lightweight helmet that still protects you at the highest level. MIZUNO DRYLITE(R) Inner Lining: Transports excess moisture away from the body to create a comfortable and dry body microclimate for optimum performance EVA Foam inner core provides superior protection and interior comfort ADDITIONAL DETAILS: Meets NOCSAE Standards Helmets are specific for RH and LH Batters. Batter's Face Protector is not interchangeable Junior = 6 3/4" - 7 3/8", Senior = 7 3/8" - 7 7/8"