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Vos crampons jaune fluo sont vraiment magnifiques.

Vos crampons jaune fluo sont vraiment magnifiques.
Your neon yellow cleats are truly magnificent.
From Lesson 395:Invariable color adjectives (marron, bleu clair)·French

Questions & Answers about Vos crampons jaune fluo sont vraiment magnifiques.

Why is there no s on jaune fluo when it describes the plural noun crampons?
Compound color adjectives (colors made up of two or more words) are always invariable in French. Because it is a compound color, neither jaune nor fluo changes to match the plural noun.
Would I add an s if the cleats were just yellow, without being neon?
Yes, you would. As a single, simple color adjective, jaune follows standard agreement rules, so you would write Vos crampons jaunes. It only becomes invariable when you add a descriptor to make a compound phrase like jaune fluo, jaune clair, or jaune foncé.
What exactly is fluo? Is it slang?
fluo is the everyday, shortened form of fluorescent. While it is an abbreviation, it is the completely standard, universally used term for neon colors in French, not just informal slang.
Why does magnifiques take an s while the color doesn't?
magnifiques is a standard descriptive adjective. Unlike compound colors, regular adjectives must follow the normal rules and agree in gender and number with the noun they describe. Since crampons is plural, magnifiques needs an s.

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