The Caliber Leather Jacket is made from durable premium leather which incorporates strategically positioned stretch zones for fit and ventilation intakes for internal air cooling. With class-leading protection and the ability to upgrade to Alpinestars Nucleon chest and back protective system, the certified Caliber Jacket is ideal for road riding. Features Durable premium leather main chassis constructed from 1.0 – 1.2 mm high grade leather. Strategically positioned stretch panels on sleeves and chest for improved fit and feel. Accordion leather stretch inserts on waist, elbow and rear shoulder for an enhanced range of movement. Two zippered hand pockets plus inner waterproof wallet pocket. Zippered air intake vents are strategically positioned for optimized airflow when opened. Localized perforations offer excellent ventilation and internal airflow. Low profile collar construction with microfiber comfort edging plus 3D textured fabric inner collar lining for comfort. Pre-curved sleeve construction reduces fatigue and improves overall fit. Hook and loop grip cuff adjuster helps keep jacket in position. Reflective details make the rider more visible to other road users. Mesh full lining for breathability and comfort. Removable thermal liner means jacket can be worn in a variety of climates. Inner waterproof wallet / document pocket. Waist connection zipper allows jacket to attach to Alpinestars riding pants. Embossed logos and direct print graphic details for unique look. CLASS-LEADING PROTECTION Chest pad and back compartments (Alpinestars Nucleon chest and back inserts available as accessory upgrade). Multiple snap button system to integrate the Level 2 certified Alpinestars Nucleon back protector. Level 1 certified GP-R shoulder and elbow protectors. External Dynamic Friction Shield (DFS) shoulder slider for impact and abrasion resistance.