At just 2.5 lbs for a size medium, this helmet is as light as many carbon helmets that sell for three to four times as much. Designed for BMX Racing, FreeRide and DH Mountain Biking, the Default features an aerodynamic poly-alloy shell, sharp graphics, 21 vents to keep you cool on hot race days, removable and washable liner and cheek pads, padded chin strap with a D-ring closure, aluminum visor screws, and a CSPC Certifed EPS foam liner for protection. HELMET SIZE HAT SIZE INCH/CM Youth Small 5 7/8 - 6 18.25in - 19in 47cm - 48cm Youth Medium 6 1/8 - 6 1/4 19in - 19.75in 49cm - 50cm Youth Large 6 3/8 - 6 1/2 19.75in - 20.50in 51cm - 52cm Adult X-Small 6 5/8 - 6 3/4 20.50in - 21.25in 53cm - 54cm Adult Small 6 7/8-7 21.25in - 22.00in 55cm - 56cm Adult Medium 7 1/8-7 1/4 22.00in -23.00in 57cm - 58cm Adult Large 7 3/8-7 1/2 23.00in - 23.75in 59cm - 60cm Adult X-Large 7 5/8-7 3/4 24.00in - 24.50in 61cm -62cm Adult XX-Large 7 7/8-8 24.50in - 25.25in 63cm - 64cm
