MET Hooray Kids Helmet Dusted Green Size:S Features the Highest Grade of MAS STM M Features the Highest Grade of Micrometer Thick TPUDeployed Across Seven Sealed Layers to Maximize Airtightness and DurabilityUncolored to Ensure the Highest Material Quality and Prevent Air Retention Issues Caused by Dye Related Surface ImperfectionsBase of Valve Shaft is Slightly Conical to Improve Fit to Wheel Rim and Reduce Unwanted MovementValve is Internally Threaded to Allow Use of Valve Extensions or Replacement Valve CoresLightweight and Durable Within a Small Packing SizeEasy to Repair Solution dyed AX® RPET 0 We put more than 30 years of experience into every kids’ helmet we develop In mould polycarbonate shell with EPS linerExtended head coverage and integrated visor for all round head protectionFontanel protection thanks to MET Bimbi Secure TechnologyAnti pinch ratchet buckle makes it easier to secure the helmet10 vents