Rawlings Vented Pro Baseball Base Coach s Helmet Description: This is a pro style coaching helmet with the Coolflo design. The shell features premium ABS with a clear coat paint job for protection while coaching the bases. Level: Pro Series: CoolFlo Shell: Premium ABS shell with Clear Coat, Exclusive Coolflo venting technology Sizes: 6 7/8, 7, 7 1/8, 7 1/4, 7 3/8, 7 1/2, 7 5/8 Spec: Official Base Coach Helmet of Major League Baseball Type: Catcher, Coach Helmet Sizing For helmet size, measure the circumference of the head just above the ears and refer to the chart for accurate sizing SIZEHat SizeHead CircumferenceExtra Small6 3/8 - 6 1/220 - 20 1/2 Small6 5/8 - 6 3/420 3/4 - 21 1/4 Medium6 7/8 - 721 1/2 - 22 Large7 1/8 - 7 1/422 1/4 - 22 3/4 Extra Large7 3/8 - 7 1/223 - 23 1/2 Double Extra Large7 5/8 - 7 3/423 3/4 - 24 1/4