Alpinestars GP-R Leather Men's Riding Jacket (Black/White, Size 52) Large accordion stretch panels help movement and comfort on the bike Stretch panels on sleeves and chest further improve fit and feel Chest pad compartments with PE padding (Alpinestars Bionic Chest pads available separately) Multiple snap button system to integrate the Level 2 CE-certified Alpinestars Bionic Back Protector 3D mesh and neoprene collar construction