TriplePly Knee Sleeves from CERBERUS Strength CERBERUS The three-headed dog represents force as well as bravery. The legendary monster is often depicted as a remarkably terrifying sentinel of Hades, safeguarding the afterlife. With its tri countenances and an athletic body, the legendary Cerberus strikes awe among any who cross paths with it. Mythology tells us that its huge strength has the capability to crumble any and all hindrance in its track.