Waterproof Mens 3D Mesh Vest, X-Large Dual Layers of 3D Mesh - The side and shoulder panels have double layers are made of soft and stretchy 2x3mm 3D Mesh. Comfortable and adjusts to different body shapes. Triple layer 3D Mesh - Three layers of super insulating constant volume 3D Mesh in the front and back panels. A total thickness of 11mm. Mid layer has a stronger 70 Denier mesh - same type as the patented lining of the D1 Hybrid suit. YKK zipper - High quality YKK Vislon zipper no 5.