Review (3/5): Be Careful!  Follow directions.
First use was easy- I have Super calloused feet. Used before bed for recommended time. Feet were soft but back to normal mid-day. Second use I slept in the booties. Soft feet but about the same amount of time until back to normal. The exception: 24 hours after sleeping in them, I developed massive case of hives on both feet. If you are prone to dermatitis, don’t use.