What's a Swim Brief ?
A swim brief or racing brief is any briefs-style male swimsuit such as those worn in competitive swimming, diving and water polo. The popularity of the Australian Speedo brand racing brief has led to the use of its name in many countries around the world (e.g. the United States, New Zealand, UK, Europe and mostly the Philippines) to refer to any racing brief, regardless of the maker. Occasionally, the Speedo genericized trademark also applies to square cut swimsuit, but in general the generic term is used in reference to swim briefs. Swim briefs are also referred to as competition briefs, swimming trunks, bathers, racer bathers, posing briefs, racing briefs, and colloquially in Australia as "budgie smugglers".
Like underwear briefs, swim briefs feature a triangle-like shaped front and a solid back providing form-fitting coverage. They typically are worn below the lower waist. They are generally secured by thin banding at the upper thighs and either a drawstring around the waist or an elastic waistband. Swim briefs are most often made of a nylon and spandex (Lycra) composite, while some longer-lasting suits are made from polyester and still others from other materials. Most swim briefs have a beige or white front lining made of a similar fabric.
Swim briefs are worn by professional and recreational athletes in many water sports. They are the standard for competitive diving and water polo. They are preferred in competitive swimming for the reduction of the water's drag on the swimmer, although jammers and bodyskins are sometimes worn instead of the swim brief. Participants in sports that require a wetsuit such as waterskiing, scuba diving, surfing, and wakeboarding often wear swim briefs as an undergarment to the wetsuit.
While swim briefs are used worldwide by athletes for water sports, the popularity of swim briefs as casual beachwear and swim wear varies throughout the world. In mainland Europe, briefs are relatively common among male casual swimmers and beach goers. In the United States and the United Kingdom, the roomier and less revealing trunks or board shorts are the suits preferred for recreation, although swim briefs are still seen to some extent. In some swimming pools in France, men are only permitted to wear swimming trunks and not shorts, for reasons relating to hygiene. Swim briefs are chosen for recreation include style, ease of movement in the water, sunshine exposure, quick drying time, and the ability to be worn under pants or shorts. Former Australian prime minister Tony Abbott was a fitness fanatic noted for wearing "speedos" or "budgie smugglers".
Swim briefs are sometimes worn under board shorts for modesty purposes, and they are often used as an athletic supporter under shorts during sporting activities.
Source : Swim Briefs Wikipedia