Macon H2O The Macon is Bern's core rider lid. Worldclass champions and legends in pool, vert, street and big air like Andy MacDonald, Tom Knox and Jeff Grosso rock the Macon. They love the clean low profile fit, style, quality and burliness of the Macon. The Macon is one of Bern's most requested All SeasonWeight 15.7 18.2 oz ABS Shell SIZE CHART SIZE HEAD SIZE S 21 in. 21 7/8 in. M 21.7/8 in. 22 1/2 in. L 22 1/2 in. 22 1/4 in. XL 22 1/4 in. 23 7/8 in. To ensure a perfect fit, measure the circumference of your head starting in the middle of your forehead and match it with the sizes above.