A disposable sandal is adapted to apply an advertising message repeatedly into sandy soil at a beach or the like. The sandal is formed of sheet material, and a pair of blind-ended slits in the sheet material define an elongate stem and a strap integral with and extending to either side of the stem. The sheet material is sufficiently flexible that the stem and strap can be raised by hand from the general plane of the sheet material. The stem is received between the wearer's toes and the strap is fitted over the wearer's foot to retain the sandal. The sandal has a lower exposed surface with projections defining a mirror image of the advertising message. The projections are sufficiently large that the advertising message is stamped repeatedly into the soil in a form intelligible to the unassisted human eye, as the wearer walks.