"Side zipper" refers to a type of zipper that is located on the side of something, like a piece of clothing or a bag. It allows the item to be opened or closed from the side instead of the front or back. Full definition
The features for these boots include a sequin fabric open toe, open back, fringe throughout, and finished with a full inner side zipper closure. (pinkbasis.com)
Pretty casual dress featuring vivid floral pattern, flattering high waistline and adjustable spaghetti straps with invisible side zipper for an easy fit. (zaful.com)
The closures are an invisible side zipper with hook - and - eyes and snaps in back side. (1stdibs.com)