Size_SM/MD 20-1/2 to 22-3/4` (52 to 58 cm)

Bike Helmet Aerius Sparrow SM/MD 20-1/2 to 22-3/4in (52 to 58 cm) Light Blue All Purpose HELMET AERIUS SPARROW S/M L-BU CPSC approved 23 vent helmet Rear Head Lock retention system for a snug fit Removable visor Removable/Washable pad system