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The Britax Römer ADVANSAFIX PRO will give you peace of mind for years, the ADVANSAFIX PRO is designed to grow with your little one. Approved to the latest i-Size safety standards (UN R129), you give your child ultimate protection on every journey. Simply convert from a harnessed seat to a highback booster seat in a few easy steps, and it's suitable from 15 months right up to 12 years. What's more, its 5-point harness can be used for longer as it's suitable for children up to 105cm.