Alpinestars (6537013-12-S/L Black/White Small/Large Bionic Rib Protector A high-performance, lightweight, ergonomically constructed guard for the ribs and kidneys The Bionic Rib Support incorporates intelligent adjustment features to offer kart drivers a supremely comfortable, customized and supporting fit Central adjustable back panel with Velcro attachments offers complete range of fit allowing protection to be worn under or over garment Fully adjustable front strap with a D-ring closure features elasticated section for comfort Perforated rear for comfort and ventilation