Definition of «flat boots»

"Flat boots" refers to a type of footwear that has a flat sole, without any heel.

I have a pair of flat boots with a furry lining, which I love. (dreamingincashmere.com)
I also love these short boots and tall flat boots for travel, and of course, for fall! (wendyslookbook.com)
I found both over the knee flat boots and over the knee boots with heels. (thefashionablehousewife.com)
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