Premium leather main chassis constructed from 1.3 mm genuine bovine leather. Large accordion stretch panels help movement and comfort on the bike. Stretch fabric panels on sleeves, crotch and chest further improve fit and feel. Ergonomic back hump, sculpted for better airflow and performance at high speed. Pre-curved sleeves and legs construction. Localized perforations highly improve ventilation. Printed graphic details. Aramidic fiber inserts on arm and leg for critical seam reinforcement. Patented one-piece knee stretch accordion. Calf expansion gusset. Reflective details. Chest pad compartments with PE padding (Alpinestars Nucleon chest pads sold separately). Multiple snap-button system to integrate the Level 2 CE Certified Alpinestars Nucleon Back protector (sold separately). Innovative inner cuff and calf adjusters. Integrated padding increase comfort and protection. Multi-layer, reinforced knee construction and grip texture for bike contact. Removable mesh inner liner for convenience and breathability. Inner waterproof wallet pocket. 3D textured fabric comfort collar construction. Knee multi-layers reinforced construction. CE Certified Alpinestars GP-R protection on shoulders, elbows and knee. DSF external dual-density TPU sliders: shoulder, knee. Innovative new elbow slider is anatomically contoured and features a removable and replaceable screw-mounted insert slider. SPORT knee slider. RR - external dual-density TPU sliders: shoulders.