Hi and welcome to my first instructable.

I thought I would start with something that I use on a daily basis and which has pretty much become a necessity for me.

To start it should be known that I have pretty large feet (size 16 in the US) and due to this size I also tend to experience discomfort in my feet when not properly supported.  Having larger feet it can be difficult to find shoe inserts in my size, often times they run only to a size 13 and in my shoes slide around and leave a sharp edge towards the toes.  My solution was to create my own inserts from cheap readily available materials which I could size however I wanted.  This is my second time creating them so I have had several years to try them out and have found they work quite well for me.

Step 1: Materials

For this project I want to keep the materials pretty simple.  All you really need to do this is your base material and a way to cut the shape.  I prefer the puzzle style cushion mats which I was able to pick up at Harbor Freight for under $10 for a 4 pack.  Even with my size 16 shoe I get quite a lot out of even a single mat so make as many as you want or have time for.  I also experimented with cutting with a rotary tool this time and while it was much easier than a knife and left a cleaner edge I find the knife to be easier to follow the shape.

I did not try myself due to lack of the tool but if available I bet a hot knife/wire would work very well for this.  Just be sure to avoid any volatiles given off from this.  Be sure to do in a well ventilated area.
<p>This is my third time rewriting this, grrrrr. Okay. I underpronate. I'm broke and can't afford inserts. What do you think of me making these and then putting something underneath the outside of the insert to keep my foot at a slight tilt toward the inside. Do you think this would work? Maybe cotton balls? Don't want it too thick, hence too rigid and much higher than the other side. But enough that I stop walking on the outside of my foot. I've already had to have reconstructive surgery once for the damage this caused to my foot. I CAN'T go through that again. Please help me.... :)</p>
<p>Mindy, when I got sports orthotics, the dr gave me some foam sheets to do just what you're talking about. It was thinner and firmer than the floor puzzle mat foam, more like craft foam, and I could stack it, cut it, and tape it to the orthotic to keep it in place. You could try it and see if it works for you.</p>
<p>I just made a pair of these. I started working as an industrial electrician and working on concrete most of the time. Needless to say my.worn out insoles were killing my feet. I made these and started wearing them today and what a difference it made in the pain ( or lack there of ) in my feet. Thank you for posting this.</p>
<p>I would slice them in half</p>
Awesome idea. I have several of these mats sitting, un-used in my shop. I am in the same size 16 boat as you, and have been trying out materials for making replacement insoles. Have you done any running with the floor mat insoles?
I have done a little running with them but not in a while. The biggest thing I would watch for would be due to their thickness they can feel a bit unstable while running. I would maybe wait till you've worn them in a bit before using for that or if you have some way to kinda pre-wear them. And like I said above, making sure your shoes are pretty tight helps as well.

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