Also known as: 競パン, 競泳パンツ, ビキニパンツ, ブーメランパンツ
Briefs made for men specially made for swimming and other water activities. Also known as a "speedo" after Speedo, the company that helped popularize it.
As "speedo" is now aliased to this tag (see topic #9617), never use this to refer to the company or its logos; use Speedo (Company) instead.