Your question is NOT silly at all! I have been doing some basic shoe research myself for a year now and am still at a loss. But from what I have learned, good support is important and what type of support you need is based on your own foot. I went to a foot store where they scanned my feet, showed me my pressure points, watched my gait closely to see if I roll my feet inward or outward, and posture is all affected by your feet too. What I would recommend is to learn a little about your feet and invest in a orthotic that works for your foot type. It can be a little pricey $60 or so, but worth it if it will save your feet and body in the long run. Orthotics are different than Dr. Scholl's. From what I have learned Dr. Scholl's actually just increases cushion for your foot, which seems nice at first, but really isn't very good for your feet. Your feet and body need more support. Then I would use an orthotic along with a good athletic or nursing shoe that has worked in the past, they may last a lot longer for you (My shoes seem to break down after a month or so.) and give you the support you need.
Now if you are willing and able to spend more money you can ge custom made orthotics for your feet. They last longer and will work the best. Then the shoe you would want is one for support and what will promote good posture and comfort.
Now one more thing I have to say, CROCS, really aren't that good for your feet if you are going to be on hard floors for twelve hour shifts. They are actually really bad. Once again the super cushion feels good, but is really bad for your feet and will not give support your body really needs. I have a pair of crocs and love them to wear around town and such, but when I get to work I really haven't found them to be that great. Sorry for the avid Croc lovers out there, When I am wearing them at work I notice that I really have less momentum in my step and have no support in my arches. Cushion may feel nice, but it is decieving.
Okay that's my opinion on shoes. Like you, I have been working on my own research to take care of my feet and body!
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