Why are the floors at McDonald's so slippery even with non slip shoes?

I just started at mcdonald's today, and it felt like I was walking on ice. I looked at the tag of the shoes I bought, and it said non slip. When I got there, my manager looked at the bottom of my shoes, and he said they look like non slip shoes. He said something about having to walk with them on a carpet for a half hour to get rid of the static electricity, or something. Anyways, he didn't seem too concerned, but im afraid im gonna fall and hurt myself. Maybe its not even my shoes, and there is just too much grease on the floor?

Why are the floors at McDonald's so slippery even with non slip shoes?
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