Is Wintermütze der, die or das?

The correct German article for Wintermütze is die. The noun Wintermütze is Feminine. So you always say: die Wintermütze. Learn the article together with the noun — German nouns don't follow predictable gender rules most of the time.

The plural of Wintermütze is: die Wintermützen. In the plural, every German noun takes the article "die". So: die Wintermützen. Example: ein Wintermütze → zwei Wintermützen.

Correct: die Wintermützen. The form "die Wintermützes" is wrong. The plural of die Wintermütze is die Wintermützen. In the nominative plural, you always use the article "die".

die Wintermütze follows the four German cases. Nominative: die Wintermütze, Accusative: die Wintermütze, Dative: der Wintermütze, Genitive: der Wintermütze. In plural: die Wintermützen / den Wintermützen. Learn these forms together with the noun.

The genitive singular of die Wintermütze is: der Wintermütze. The genitive plural is der Wintermützen. German uses the genitive to express possession or belonging. Example: die Farbe der Wintermütze.

The dative plural of Wintermütze is: den Wintermützen. In German, dative plural nouns usually end in "-n". So you say: "mit den Wintermützen". Use this case after prepositions like mit, von, bei, zu.

Wintermütze ends in -e. German nouns with this ending are almost always feminine. Nouns ending in -e are often feminine (die), especially two-syllable words. That's why the article for Wintermütze is die.

Wintermütze is a noun and must be capitalized in German. You'll find example sentences above for each case. The article die stays the same in nominative singular but changes in other cases. Practice declension in your own sentences.

Yes, Wintermütze is a noun (also called a substantive). German nouns are always capitalized. The article for Wintermütze is die. Every German noun has a fixed article you must memorize.