An article from Healthbolt raised couple of good points on your feet and how to buy shoes that fit. The post talks about your feet size will change throughout the entire life, and what are the actual ways to measure them and get the correct size of shoe:
Measure your feet once a year. Your foot size will change throughout your entire life. It may not be as dramatic as the 18 and under crowd, but they do change. For instance: when I started running about 2 years ago I was a 10.5; now I’m an 11. (I’m 25 years old.)
There are three dimensions you should measure your feet by when purchasing a shoe. Size (which is really “length”), arch and width.
All three of these can be measured within a few seconds by anyone at a reputable shoe store. Make sure they measure both feet since no one’s feet are both the exact same size…
Buy Shoes that Fit Every Time – [Healthbolt]
There are specialised running stores that often have equipment like a lightbox which measures all the dimensions of your foot, plus a treadmill with a videocamera which the staff can use to analyse your running style.
From this you can get a recommendation of which sort of running shoe will give you the best support and correct any natural variations in your running style to help prevent injury.
Many of these shops will also have a stock of good quality walking shoes. It may cost a little extra for the level of service, but it will certainly pay off if it can help you avoid injury.
If the shoe fits……
An article at Healthbolt (by way of Lifehack)describes in detail what to look for when buying shoes, how to measure your feet for a perfect fit and how to make sure that your shoes will be your best friend for a long time….