Alpinestars Celer Leather Jacket Features Removable CE-certified Bio-Armor shoulder and elbow protection Durable 1.3 mm leather construction with flexible poly-fabric and leather accordion stretch panels on back, waist and arms Chest compartments with PE padding (Alpinestars Bionic chest pads available as accessory upgrade) Multiple snap button system to integrate the Level 2 CE-certified Alpinestars Bionic Back protector External, dual-density TPU shoulder sliders Strategically positioned perforated leather zones on front and back Poly-fabric stretch inserts on sleeves Auto-locking zippered cuff adjustments Moto GP profiled, aerodynamic and perforated back hump Multiple external perforated leather panels with protector foam inserts Zippered Dynamic Flow Control (DFS) air in-takes External zipped hand pockets and internal pockets, plus wallet pocket D-ring waist adjustment Neoprene comfort edge on collar and cuff Rear reflective detailing for improved rider visibility Mesh lining improves jackets breathability