After a hip replacement, my right leg was 1/4 inch shorter than my left leg which led to my developing a noticeable limp which was also affecting my back. I found this company when googling shoe lifts and was impressed with the reviews. I have now had lifts put in 5 pairs of shoes and my limp is 99% gone. When looking you can see the lift, but when they are being worn it is not noticeable unless you draw attention to it. I highly recommend this company.