This term refers to the cooperation between the YaYa brand and other brands or designers to jointly launch joint-style down jackets.

Among them, "Ice Shell" is a new down jacket series released by the YaYa brand at Milan Fashion Week in 2023. It uses Icelandic goose down as the down raw material. The design combines the elements of jackets and down jackets, and its positioning It is a fashionable down jacket.

On this basis, the Yaya Ice Shell series has also been co-branded many times, such as co-design with Burberry’s men’s clothing director, and co-branded with Lay’s to launch co-branded products. These co-branded down jackets have a high level of design and quality, and have received widespread attention and praise from consumers.