Designed to perform in demanding sports medicine, physical therapy and high-use Pilates and yoga sessions, the roller with the highest density is the OPTP AXIS Foam Roller. Relieve tight or injured muscles, perform self-myofascial release on trigger points and knots, self-massage soft tissue and roll away soreness. Professionals use high-density AXIS Black Rollers to roll out tough muscle adhesions in the heavier lower extremities including the iliotibial band (IT band), piriformis, hamstrings or quads.