Fully removable Replaceable and washable liner Optional liner sizes available for a custom fit Four top vents DOT Approved. Meets The FMVSS 218 Standard SNELL-2020 Offering three distinct configurations, allowing the user to choose which works best for their riding needs, the new XD4 is similar in appearance to the previous XD3, but greatly improved in all-around performance. The combination of the new comfort headliner, with microfitting 5mm peel-away temple pads, and our patent-pending FCS cheek pad design, also with 5mm peel away layers, add a new dimension to the concept of helmet fit and customization. It takes a unique sense of commitment to continually strive to improve your product – especially when it's already regarded as the very best. Fully removable. Replaceable and washable liner. Optional liner sizes available for a custom fit. Four top vents. DOT Approved. Meets The FMVSS 218 Standard.