If you are looking for a light mtb helmet for children who offer high protection, Flare boys helmet is the one for you:
helmet for children of Size adjustable
strong ventilation and cooling
true lightness

Specific

– For young cyclists: All-Mountain/Enduro helmet is designed specifically for children and teenagers.– Particularly light: thanks to the light inmold cap, the helmet weighs only 250 g.– Easy to handle: the magnetic closure in Fidlock Safety aluminum allows opening and a playful closure, even with gloves.– Ventilation and cooling: multiple air intakes ensure that they maintain fresh head even during long missions thanks to ideal ventilation.– Customize the size: the fit is adjustable individually from 51 cm to 56 cm via a retention system in the back of the head.– Comfortable lining: the ultra soft lining of this O’Neal helmet absorbs sweat, is washable and can be easily removed.– Standardized safety: with its strong features this Mountain Bike helmet exceeds the Safety Standard CE 1078 for bicycle helmets.

Size UNIQUE: 51-55 cm