Constructed with three layers of impact-grade ABS material and high-density, impact-absorbing, contour comfort foam for maximum protection and comfort 17 sleek ventilation portals for increased air flow DuraVent Universal Jaw Guard included for added jaw protection for either side ...Constructed with three layers of impact-grade ABS material and high-density, impact-absorbing, contour comfort foam for maximum protection and comfort 17 sleek ventilation portals for increased air flow DuraVent Universal Jaw Guard included for added jaw protection for either side of helmet Laminated, moisture wicking liner and fully wrapped ear pads keep you cool, dry and comfortable One size fits most: Senior (7 - 7) & Junior (6 - 7) Constructed with multi-layered, impact-absorbing contour comfort foam and universal jaw guard, the Marucci DuraVent Batting Helmet provides maximum protection at the plate and is NOCSAE/SEI certified. With 17 sleek ventilation portals for increased air flow and moisture wicking liner, the DuraVent helmet not only keeps you protected, but also cool, dry and comfortable.