noun
woolly nylon
A type of nylon yarn with a soft, wool-like texture, often used in socks, tights, and knitwear.
この靴下はウーリーナイロンでできているので、とても暖かい。
These socks are made of woolly nylon, so they are very warm.
Alternate spelling with a middle dot; less common but still seen.
From English 'woolly nylon'.