Use+the+GRID+for+a+self-massage+and+roll+through+the+tight+muscles%2C+knots+and+kinks+that+prevent+feeling+good+and+moving+well.%3Cbr+%2F%3E%0D%0AThe+GRID+foam+roller+is+designed+with+proprietary+Distrodensity+zones.+This+three+dimensional+surface+has+a+variety+of+widths+to+replicate+the+feeling+of+a+massage+therapist%26rsquo%3Bs+hands.