The ALPINESTARS MTB Jacket Mid Layer is expertly crafted from high-quality polyester material, featuring a multi-layered, three-layer main construction. It incorporates a poly-fabric and a windproof membrane to provide optimal insulation where it is needed most. This jacket is designed with an extended back panel to offer additional coverage while riding. Additionally, the ends are lined with silicone to ensure the jacket stays securely in place, providing a comfortable and reliable fit during your cycling adventures.