Premium leather main chassis is constructed of 1.3mm genuine bovine leather, Large accordion stretch panels help movement and comfort when on the bike, Stretch fabric panels on sleeves, crotch and chest further improve the fit and feel, Ergonomic back hump is sculpted for better airflow and performance at high speeds, Pre-curved sleeve and leg construction, Localized perforations highly improve ventilation 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 gusset, Chest pad compartments with PE padding (Alpinestars Nucleon chest pads available as an accessory upgrade), sold separately, Multiple snap button system to integrate the Alpinestars Nucleon back protector, sold separately, Innovative inner cuff and calf adjusters, Integrated padding to increase comfort and impact resistance, Multi-layer reinforced knee construction and grip texture for superior on-bike contact, Removable inner mesh liner for convenience and breathability, Inner waterproof wallet pocket, 3D textured fabric comfort collar construction, Knee multi-layer reinforced construction, Alpinestars GP-R protectors on shoulders, elbows and knees, Innovative new elbow sliders are anatomically contoured and feature removable, replaceable screw-mounted slider inserts, GP knee sliders, External dual-density TPU sliders on shoulders