Anti-fatigue Support Slide insole into the shoe and test the fit. Trim a little of the toe area at the time to fit. The Insole heel should fit firmly up against the inside heel of your shoe. this is perfect or your heel support and feels like there is extra comfort for your feet. Even after a long tiring day, your feet will feel fresh and it can be great for everyday use. The insoles are completely comfortable and are flexible, they take the shape of the feet very well. The insoles have a gel inside them which gives a feeling of massage to the feet.