A hit product: an item that sells especially well in the market; used for consumer goods or manufactured products with bestseller-like success.
新商品の宣伝が功を奏し、ヒット商品になった。
The new product's advertising paid off and it became a hit product.
この季節限定のフレーバーがヒット商品となり、売り切れ店が続出した。
The seasonal limited flavor became a hit product, and many stores sold out.
メーカーはヒット商品を生み出すために市場調査を強化した。
The manufacturer strengthened market research to create hit products.