Project.23 Helmet Liners are designed to precisely adjust the fit of carbon and fiberglass helmets. Depending on the chosen thickness, the inner pads allow for targeted adjustments to the fit in the upper head area. Thinner liners create more room, while thicker versions position the helmet more firmly and stably. This allows helmets to be individually tailored to head shape, comfort preferences, or changing needs. The liners also serve as replacements for worn or compressed original padding. The clear gradation of thicknesses for each size makes selection easy and ensures a clean, secure fit without compromising comfort.