Abstract: A liner adapted for insertion into a crotch portion of thong underwear for absorbing bodily fluids and protecting the garment from such fluids. The liner includes a left liner edge and a right liner edge converging downward toward an apex of the liner. The liner is sized and configured such that upon insertion of the liner into the crotch portion, the liner apex contacts the crotch portion at a location adjacent a lower end of the crotch portion, the left liner edge does not extend laterally out beyond a left garment edge, the right liner edge does not extend laterally out beyond a right garment edge, and the liner apex is not overlapping with the web of the thong underwear that extends between the buttocks of the wearer. These fit characteristics ensure that the liner does not extend beyond the edges of the thong underwear or onto the web, thereby minimizing irritation of the wearer.