"This is not my red footwear."
Translation:Це не моє червоне взуття.
I see here that взуття unlike туфлі is singular. Duolingo says they both mean shoes, but is взуття only used to refer to a specific single pair of shoes?
Взуття́ is a mass noun, like the English footwear. You can use it to refer to your own specific footwear, or to footwear in general.