This is the 1050th most frequent Polish word.
buty
Shoes.
In this sentence, 'buty' refers to footwear in general, specifically the shoes the speaker has acquired recently.
Mam nowe buty.
I have new shoes.
Here, 'buty' is being described as comfortable, indicating its use as referring to specific footwear.
Te buty są bardzo wygodne.
These shoes are very comfortable.
In this case, 'butów' (the plural genitive form) is used to express the need for footwear suitable for certain circumstances.