Please note that since Brexit, the United Kingdom is no longer part of the EU VAT union. For clarity; import charges are imposed by HMRC and the courier bills recipients. Please note this does not apply to motorcycle helmets as they are exempt from VAT in the UK and as such you will not have to pay import costs for a helmet. Please note a size chart only contains numbers.
It is impossible to capture the shape and fit of a product in a size chart. A size chart does not guarantee a perfect fit.