Troy Lee Designs replacement or additional helmet X-Static liner for the 2nd generation Troy Lee Designs A2 (2.0) MTB Helmets. This helmet liner will also fit previous A2 models, just a very slight change in the shape/cosmetic appearance. Additional material added to the lower left and right side strips as well as additional strips added to the centre left and centre right. If you prefer the previous liner found in the A2, (with less material) no problem the new strips have a perforated trim so you can easily remove the newly added extra material. The A2 liner has more lining material for extra comfort and is made from a premium wicking material for extra breathability when riding to help keep you cool.