Air Vents: 8. Sizes: M (50-57). Weight: 210 g. Sizing System: Ultralight sizing system. Pads: Supersoft washable pads. Technology: In-Mould. The extra strong construction of the 149 is achieved through LIMAR advanced In-Mould technology. The design incorporates the most innovative back of the head protection of any childs helmet on the market with incredible lightness. The additional features of the super comfortable soft internal pads, 8 insect net covered cooling vents, pinch safe strap and the easy to adjust Ultralight sizing system makes the 149 a helmet a child won't want to remove.