I have used this insole for many years and was wondering where I could get another set for other pairs of shoes. I was thrilled to find them available at Natural Foot Orthotics. This insole has helped align my knees and hips such that I don't have the knee and hip pain I was getting during long walks. It is made of very sturdy material so that it doesn't compress and lose its structure over time. (I'm a big person so that is an advantage for me,) I highly recommend this orthotic.