The Caliber Leather Jacket is made from durable premium leather which incorporates strategically positioned stretch zones for fit & ventilation intakes for internal air cooling. With class-leading protection & the ability to upgrade to Alpinestars Nucleon chest & 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 & chest for enhanced fit & feel. Accordion leather stretch inserts on waist, elbow & 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 & 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 & improves overall fit. Hook & 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 & 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. logos embossed & direct print graphic details for unique look. CLASS-LEADING PROTECTION Chest pad & back compartments (Alpinestars Nucleon chest & 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 & elbow protectors. External Dynamic Friction Shield (DFS) shoulder slider for impact & abrasion resistance.