Cosco s Rio Football cover is made up of polyvinyl chloride and is machine stitched, which makes it resilient to abrasion and rough gameplay.The machine stitched synthetic top cover is highly durable and suitable for long training and practice sessions.!! The cover and panels keep the shape of the ball in place. The air valve keeps the air inside tightly locked which gives an excellent rebound quality to the ball.There are nylon windings on the cover which make the ball resistant to wear and tear. The butyl bladder which maintains the air pressure inside the ball and lets you enjoy continuous gameplay for hours.