Boxer shorts (1) including a pants portion (2) made of a textile fabric, which pants portion (2) includes: A front part (3) that includes a central panel (4) intended to cover the genital organs of a wearer, and two front side parts (5a) (5b), each intended to cover at least part of the front surface of one leg of the wearer; A rear part (6) that includes a rear panel (7) intended to cover at least the majority of the buttocks of the wearer, and two rear side parts (8a) (8b), each of which is intended to cover at least part of the rear surface of one leg of the wearer; and A middle part (9) intended to cover at least one upper portion of the inner surfaces forming the crotch of the wearer; which boxer shorts (1) are noteworthy in that the rear panel (7) and the middle part (9) display at least one degree of expandability that is substantially greater than the corresponding degree of expandability of the front part (3) and of the two rear side parts (8a) (8b).