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の髪の毛

…'s hair

→ の
phrase Uncommon #19,289
…'s hair の marks possession and follows the person or thing whose hair is being described.
JA: 私の髪の毛は黒い。
EN: My hair is black.

こいつの髪の毛と同じしたらどう？

How about making it the same as this guy’s hair?

メアリーの髪の毛はカールしてます。

Mary's hair is curly.

私のおじいちゃんの髪の毛、雪のように白いのよ。

My grandpa's hair is as white as snow.