Marucci Adult SI-80 High Speed 80 MPH Batting Helmet (Black, Medium) : Engineered for maximum protection against high-speed impact, the Marucci SI-80 High Speed Batting Helmet provides a comfortable fit and keeps you safe from any wild pitch. The adult SI-80 Batting Helmet is offered in multiple sizes to help you find that ideal fit. The patented impact-dispersing Unequal Kevlar pad system is lined with pro-inspired moisture-wicking fabric to keep you cool and comfortable.