I have just been using one of the lifts as I developed scoliosis after some surgery which has left me lopsided. They are higher than the 1inch stated on the packet (more like 3.5cm). I have needed to go up a shoe size to accommodate them in my shoe. They fit better and more comfortably in lace up boots rather than shoes as they don't leave enough room in most shoes to fit well. I have worn them for a month and they are wearing well and are comfortable.