Let me explain my goal first. It's a little weird, so bear with me.
I will be visiting two national parks within two weeks of each other, but I will be on foot with my backpack and no car. Therefore, UL concepts apply.
When you are out in the national parks, most of the time you clean up in the nearest stream. However, in each of these two national parks, there is a pay-type public shower near a campground. After a week at a time of being grubby, it might be nice to hit a hot shower. In most of these public showers, the floor is pretty disgusting. They are not the most sanitary in the world. So, wouldn't it be nice to have UL shower slippers?
I decided that a half-inch-thick sole would be good, and Reflectix comes in quarter-inch-thick layers, so two layers would do it. I traced the sole outline of a small running shoe onto the material and cut out two right and two left pieces. I fabricated top over-the-foot straps out of two layers of mosquito net sewn together.
I held the top strap over one Reflectix sole and fastened it underneath so that it would fit my foot. Then I stuck the second Reflectix sole underneath that and adhered it with spray adhesive. That leaves the top strap stuck between the two layers of Reflectix. Then I applied a little extra seam sealer around the edges. Done. One pair-One ounce.