The HELD Knee Protector D3O is a flexible soft foam protector that offers exceptional impact absorption. The intelligent molecules within the protector move freely during normal conditions, making it soft, flexible, and adaptable to the body. Upon a sudden impact, these molecules instantly lock together, providing exceptional shock absorption. This reaction happens in a fraction of a second, and the molecules return to their original state just as quickly once the impact is over. Designed for ultimate protection and comfort, this knee protector is suitable for off-road adventures and can be seamlessly inserted into jackets or pants.