Alpinestars GP Pro Leather Jacket 1.3mm full grain leather. PU external sliders on the shoulders, elbows and knees. Aerodynamic, dual density back hump. Lateral accordion stretch panels across the back. Accordion stretch panels in the elbows. Additional stretch panels in the sleeves. Inner mesh lining with stretch panel inserts work with outer stretch zones for a snug fit. Removable CE certified GP elbow and shoulder protectors. Chest and back pad compartments with PE protective padding (Alpinestars back protector insert and chest guards available as accessory upgrade). Bionic Back Race snap connection system. D-ring Waist adjustment. Internal waist connection zipper for attaching to riding pants. YKK auto locking zippers.