Podiatry felt is a commonly used padding material by podiatrists to treat a wide range of problems in the feet. Podiatry felt is a natural material that is semi-compressed into the padding that has a self-adhesive backing, which is usually hypoallergenic. The felt padding comes in flat sheets that can be then be cut to any shape with scissors or it comes in multiple different shapes or comes as pre-cut pads for different types of foot problems and different positions on the foot.
The protective sheet over the adhesive padding is removed and the felt pad is adhered to the foot to protect just about any painful area to give that area a rest so the symptoms and be relieved and the problem given a chance to heal up.
The felt padding needs to be as firm as is needed to do the job that it is being used for. If it is too soft, the shoe or ground will just compress the pad and it will do nothing. If it is too hard, it will be uncomfortable and possibly not tolerated. Depending on what it is being used for, will dictate how firm the felt should be.