Air Vents: 8. Size: S (45-52). Weight: 190 g. Sizing System: Ultralight sizing system. Pads: Supersoft washable pads. Technology: In-Mould. The 124 is a smaller version of the 149. Light and super comfortable, it ensures excellent back protection and complete safety thanks to its one piece In-Mould technology. Equipped with insect net, 8 vents, soft internal pads, pinch safe and ultralight sizing system, the 124 is the perfect choice for your childrens' first helmet.