With a Moto GP-derived, perforated back hump & Alpinestars Dynamic Flow Control zippered ventilation intakes, this aggressively styled, technical jacket offers street & track riders superb interior climate control. By incorporating strategically placed stretch paneling the Celer affords a superior performance fit &8211, as good as a second skin. Construction Robust 1.3 mm leather construction for a highly durable & abrasion resistant performance. Flexible aramidic leather stretch panels on back, waist & elbows for a highly contoured fit & comfort. Extensive microfiber stretch inserts positioned on sleeves to offer increased maneuverability when riding. Pre-contoured sleeves are technically engineered to offer optimized riding fit. Safety performance Removable Bio-Armor shoulder & elbow protection for class-leading impact protection. Chest compartments with PE padding (Alpinestars Bionic chest pads available as accessory upgrade). Multiple snap button system to integrate the Level 2 Alpinestars Bionic Back protector to ramp up safety performance. External, dual-density, TPU sliders on shoulders & elbows offer unsurpassed impact dissipation & abrasion resistance in critical areas. Innovation & comfort Alpinestars Dynamic Flow Control system features zippered air in-takes & exhausts to allow efficient regulation of interior airflow. Moto GP profiled, perforated back hump for enhanced aerodynamic & ventilation performance. Full mesh lining improves jacket&8217, s breathability & features Velcro®-securing internal pockets. External perforated leather panels on chest & back include protector foam inserts. Adjustable cuffs are zippered for enhanced fit & customization. Combined D-ring & Velcro® waist adjustment for highly personalized fitment. Collar & cuffs feature padded 3D mesh for excellent breathability, plus Neoprene® comfort edge. External zipped hand pockets feature leather zip garage, while internal wallet pocket features red pull tab for enhanced visibility. Reflective detailing on chest, arms & back for enhanced rider visibility. Full circumference waist zipper to allow attachment of Alpinestars riding pants.