The utility model relates to the field of bra accessories, in particular to a memory reset back buckle and underwear, which comprises a hook part and a ring part, each of the hook part and the ring part comprises a base body, the hook part is matched with a row of hook buckles, the ring part is provided with a plurality of rows of buckle rings, and the connection is realized by buckling the hook buckles and the buckle rings. The base body layer structure sequentially comprises an elastic base layer and a
surface layer from inside to outside. The
surface layer wraps the elastic base layer and the
retaining ring, and only part of the
retaining ring is exposed. The elastic base layer is located on the inner layer of the base body layer, the back buckle is endowed with excellent longitudinal and transverse tensile performance, automatic and accurate resetting can be achieved after stretching, it is ensured that the specification of the back buckle is stable, and the problem that a traditional back buckle deforms due to continuous stretching is solved. The supporting force of the base body layer is strengthened, so that the
retaining ring is more stable, off-line or breakage caused by repeated stretching is prevented, and the overall
structural stability of the back buckle is maintained. The
surface layer is used as an outer layer, so that internal sewing threads are hidden and protected,
foreign body sensation during
skin contact is reduced, and comfortable touch feeling is provided.