What is the role of the long zipper running from the sleeves to the back panel?
Looking at the zipper line running across the back of the jacket and the sleeves, you may wonder whether it is simply decorative or an actual functional feature that alters the garment's shape or fit.
By opening and closing the long zipper extending from the sleeves to behind the back, it serves to adjust the overall width and silhouette of the jacket into your desired shape.
The front blocks wind and rain, while the back alters the garment's shape.
The front center of the AFFINE CURVE JACKET by SAN SAN GEAR features hidden snaps that do not expose buttons on the outside, along with a flap-style placket[1]. The main closure uses a two-way YKK matte waterproof zipper that opens and closes from both the top and bottom, blocking external wind and moisture[2]. It is a solid closure.
On the other hand, the long zipper extending from the sleeve cuffs across the back panel serves to change the garment's silhouette[3]. Opening the zipper widens the fit. This means that when you layer thick clothing underneath or want to increase your range of motion, you can open the zipper to secure extra room. Conversely, closing the zipper all the way pulls the fabric inward, settling it into its neat, streamlined original form.
It has not yet been confirmed whether there is extra fabric or a mesh panel layered inside when the zipper is opened.