Swim briefs are often called "speedos" a trademarked brand that has been popular for many years. They are tight, body-hugging swimsuits with a V-shaped front that bares the thighs. Recreational swim briefs typically feature an interior lining. Briefs are much more popular in Europe than in North America.
Square-cut shorts are a body-hugging style that covers the wearer from the waist to the upper thigh. The leg openings are cut straight across for a boxy look that is slightly less revealing than angled swim briefs.
Jammers are knee-length, skintight suits used by competitive swimmers and other water sports athletes to reduce drag. They resemble bike shorts, but without the padded crotch and seat.