The Alpinestars SMX Bionic Vest is Alpinestars' answer to the protective vest for street, motard and off-road. The hard shell chest is mated to the Astars BIONIC moto gp back protector to make a tight protective unit. CE Level 2 Bionic Back Protector.   Flexible front chest plate, covering the Sternum, rib cage and vital organs with internal impact absorbing foam.   Thermoformed ergonomic front and rear biofoam panels for additional comfort.   Adjustable shoulder and kidney straps for full adjustability and personalized fit, ensuring comfort while riding.   Ergonomically shaped side plates for side impact protection.  

SIZING TIP- order the same size you would order in a fitted t-shirt.