The POC Joint VPD Air Knee Protector features a lightweight and flexible padding that is barely noticeable - ideal for riders who desire complete freedom of movement and reliable protection. The POC VPD Air padding is both highly flexible and highly ventilated for optimal freedom of movement, comfort, and temperature control. The padding is housed in reinforced stretch fabric that remains securely in place thanks to an inner lining of anti-slip neoprene and an elastic strap with Velcro closure.