This product is very good, and works more than advertised. Undiagnosed with planar from a previous retail job, which was 8 hours standing behind a register (heels felt like they were burning) to an industrial plant job which require squatting, walking, and climbing ladder cages and stairs. Used to use several full and partial inserts just to relieve the pressure, tension, and heel pain. Was surprised at how such a small part of the foot could affect the whole body. After some thinking, bought this, used this, lost sense of time and self, found myself on my back with a huge cheesy grin...and that was within 3 minutes. 15 minutes, ermagerd!!! That said, and perhaps my feet are a touch sensitive, a mere 15 minutes in the early morning is sufficient for a 10 hour shift on my feet and then some. If those 15 minutes are before bed with heat, am super relaxed and have pleasant and well rested sleep.My steel toe boots now simply carry a basic insert for sweat and odor.Loved this product so much, showcased it to my landlords and bought for family. I will say this, it can take a bit to get used to the sensation, and you might lose yourself for a bit, especially if you have sensitive feet.