Replacement liners for Nolan helmets. Nolan liners are anti-fungal and anti-bacterial thanks to the Sanitized fiber that is woven into the material. They are also wicking to keep you head drier. The N-43 Trilogy liners include the cheekpads. This model fits only the Trilogy helmet, if you have a N-43 (no chinbar, no sunpeak), please ordert the other N-43 liner. All liners are specific for your helmet model and each size is different. You can find the model and size of your helmet on the label located on the back of the helmet, just above the trim. VERY IMPORTANT: you have to purchase the liner size that matches the size of your helmet. You can't change the sizing of your helmet by purchasing a liner of a different size, they will not fit.