A water-resistant closure possessing a layer of waterproof material having an opening is disclosed. Attached within the opening is a slide fastening assembly comprising a pair of stringer tapes of a waterproof fabric. At least one stringer tape is longitudinally folded so as to form an internal flap positioned behind the inside surface of the other stringer tape. The internal flap blocks the entry of water which has passed through gaps present in the slide fastener device. An attaching structure secures the slide fastening assembly in the opening and a sealing tape covers the attaching structure and seals the stringer tape to the waterproof material forming the water-resistant garment closure. An article containing the water-resistant garment closure is also disclosed.