Premium leather main chassis constructed from 1.3mm genuine bovine leather, Large accordion stretch panels help with movement and comfort on the bike, Stretch fabric panels on sleeves, crotch and chest further improve fit and feel, Ergonomic back hump is sculpted for better airflow, performance, and high speeds, Pre-curved sleeve and leg construction, Localized perforation areas improve ventilation for cooling airflow on warm days, Printed graphic details, Aramidic fiber inserts on arm and leg for critical seam reinforcement, Patented one-piece knee stretch accordion panels, Calf expansion gussets, Reflective detailing, Chest pad compartment with Polyethylene (PE) padding (Alpinestars Nucleon chest pads available separately), Multiple snap button system to integrate the Alpinestars Nucleon back protector (available separately), Innovative inner cuff and calf adjusters, Integrated padding to increase comfort and impact resistance, Multi-layer reinforced knee construction and grip texture for good on-bike contact, Removable inner mesh liner for convenience and breathability, Inner waterproof wallet pocket, 3D textured fabric comfort collar construction, Alpinestars GP-R protection on shoulders, elbows and knees, DSF external dual-density Thermoplastic Polyurethane (TPU) sliders on shoulders and knees, Innovative new elbow slider is anatomically contoured and features a removable, replaceable screw-mounted slider insert