Adjustable layer system - adjust the thickness to your desired height increase Increase height to approximately 1-5cm (up to 2 inches) with multi-layers (individually removable) - can be used to 'double up' with my other insole types to increase height even more! Extremely comfortable - moulds to the shape of your foot Durable - made from monolithic gel Designed to fit shoes of all sizes (unisex) Reduces pressure on back and knees when walking - reduce spinal shrinkage with age These heel lifts are also excellent for leg length discrepancy problems Recommended by health professionals