Things like the evolution of design technology, the changes in ECE 22-05 or higher requirements, and Arai’s own changes and advancements over the years can result in the model and size you’ve “always worn” feeling differently in its current version. So, for example, if you’ve always worn a RX-7 series Medium, be sure to try the latest version in Medium, even try on a different size. You’ll be happier with the result, and will get the full benefit of your Arai.