Cordura fabric main construction provides durability and strength Stretch fabric panels in strategic areas improve freedom of movement Heat and abrasion resistant leather knee panels Back stretch polyester spandex to maximize the elasticity Lycra on the back of the legs for a better mobility Rubber knee air vents improve the airflow and give more protection to the knees Full grain leather knee panels provide coverage from abrasions and provides a best grip on the motorbike 2 side adjusters provide a perfect fitting for all the sizes.