The abstract description of the invention refers to a discardable underwear absorbent (1).Like a pair of underwear, a pair of sanitary underwear, or a pair of diapers, an adult user. The absorbent project (1) has a longitudinal direction (Y) and a lateral direction (X). The absorbent also includes a front panel (3) with a waist edge (20).A pair of legs (21A, 21B) and a pair of legs (9A, 9B).The back body panel (4) has a waist edge (25).The edge of a pair of legs (27A, 27B)A pair of side lines (10A, 10B)A major part (28) and a part about the uterus (29),A crotch (70) with an absorbent (2) mainly placed in the absorbent (1) is connected to the body, front and rear panels (3, 4).Connect the space between the body, front panel and rear panel (3, 4). Absorbent (2) consists of absorbent (5). 2. Body panels, front and rear panels (3, 4),They are also connected by opposing flanks (9A, 10A, 9B, 10B), with at least one waist opening (7) and one pair of legs opening (8). The first area of the front panel (3) has at least partial elasticity (11) extending along the legs (21A, 21B) to the front panel (3).The second region is at least partially elastic (12), close to the first elastic region (11). The rear body panel (4) has a third elastic zone (13), extending at least partially to the part covering the buttocks (29).Rear panel (4). Each elastic region (11-13) has elasticity by placing multiple elastic fibers (11T-13T) mainly in the lateral direction (X) through a major part of the body panel.Front or back (3, 4). The edge of the third elastic region (13) (13L1) may rearrange in the longitudinal direction (Y).The first region has at least a partially elastic edge (11L) and the second region has at least a partially elastic edge (12L) part of the edge (6A, 6b).RESUMEN DE LA INVENCIÓN La descripción se refiere a un artículo absorbente, de tipo calzoncillo, desechable (1), tal como un pañal de tipo calzoncillo, un calzoncillo sanitario o calzoncillo para incontinencia, para un usua
