Features:

• Dual Certified: Complies With U.S. CPSC Safety Standard For Bicycle Helmets For Persons Age 5 And Older And ASTM F-1492 Skate Safety Standards.
• Includes 2 Sets Of Sweatsaver Liners To Customize Fit
• Ideal For: Biking; Skateboarding; In-Line Skating / Roller Skating; Scooters

Sizing:

• X-Small / Small: 20 – 21.25 in (51 – 54 cm)
• Small / Medium: 21 - 22.5" (53 - 57 cm)
• Large / X-Large: 22.5 - 23.5" (57 - 60 cm)
• X-Large / 2X-Large: 23.5" - 24.5" (60 - 63 cm)