I opened the package and found that you have to trim the toe end of the insole to your shoe size. That was pretty simple since they have markings on them. Simple to do with a pair of scissors. I was a bit concerned about using them in the summer due to the fact that I wear sandals the majority of the summer. I decided to fit them for my current pair of tennis shoes.
The next day we were schedule to move our college age daughter from one apartment to another. This meant lots of lifting and several flights of stairs. A good time to put these new insoles to the test. I have to say after a day of trudging boxes and furniture around two places that my feet felt pretty good! At the end of the day they weren't swollen or hurting! I was pretty impressed!
The only major issue I have had with them is during my workout. They must have put a bit more lift in the front of my shoe because after my first run I had blisters on the top of my toes! I have worn these sames shoes for 2 years so the only thing I could figure was the insoles made the toes a big snugger than usual and that made my shoes rub in some new spots. I now take them out to workout which is disappointing as I was hoping they would make my workout feel better.
Overall I will definitely be using insoles in my dress shoes for work and maybe find a better fitting pair for my workout shoes.
I also want to recommend that you look into being a BzzAgent! It is amazing the free products I am receiving just for reviewing them!