100% polyurethane;Its particularities: Detachable elasticated mesh helmet holder TSA combination fastening system side pocket with an anti-theft cable an inner pocket with RFID protection a quick-access zipped side pocket. two zipped pockets on the straps. two tie straps two side pockets one charging pocket on the side with a USB and a micro USB port (cable included) an inner compartment for a laptop up to 15” and padded storage for a tablet to 11” two inner zipped pockets in knit mesh two inner pockets including one for bottles and another for a powerbank two detachable zip pouches for cables and accessories reinforcements on the back. padded adjustable straps and an adjustable chest strap;