We use full length cork insoles so that the insole does not slide around in the shoe, so make sure you have the correct size insole. Some people purchase leather insoles from a shoe shop as the cork insoles sometime fold or crease in the shoe over time. Then use some sort of tape to ensure the heel switch remains attached to the insole. Tapes used range from surgical tape from boots to duck tape from B & Q. So to summarise – make sure the insole fits the shoe and ensure the footswitch is well adhered to the insole. For best results and comfort the footswitch is usually attached underneath the insole with the black dot of the fooswitch facing upwards.