Effective for months, this soft insert helps relieve a variety of foot, leg, hip and back pains and improves body balance. For people with different leg lengths, it helps balance hips and back to correct posture and reduce discomfort. Takes pressure off sore Achilles' tendon and calf muscles. Peel off layers for a perfect fit - 1/8" to 3/8". Helps relieve heel, heel spur and plantar fascia pain. Fits women's shoe sizes 8 to 10, men's 6 to 8.