noun
fine, soft hair
Refers to hair that is as fine and soft as a cat's fur. Often used for baby hair or naturally silky hair.
赤ちゃんの猫っ毛は触ると気持ちいい。
A baby's fine, soft hair feels nice to touch.
彼女は猫っ毛で、髪がまとまりにくいらしい。
She has fine, soft hair, and it seems hard to keep it in place.
Compound of 猫 (cat) + っ (euphonic gemination) + 毛 (hair), literally 'cat hair'. The gemination is a colloquial intensifier.