Trunks (clothing)
Encyclopedia
Trunks, when worn as swimwear, are often referred to as swim trunks, and are normally shorter than boardshorts
Boardshorts
Boardshorts are a style of men's and, recently, women's summerwear. They were originally developed for aquatic sports, specifically for surfing, but in more recent years they have grown in popularity outside of these sports, and have become a popular form of general beach and summerwear.The name...

, which extend to the knees. Trunks are the most popular type of male swimsuit in North America
North America
North America is a continent wholly within the Northern Hemisphere and almost wholly within the Western Hemisphere. It is also considered a northern subcontinent of the Americas...

. They vary in style and design, though most are made of nylon
Nylon
Nylon is a generic designation for a family of synthetic polymers known generically as polyamides, first produced on February 28, 1935, by Wallace Carothers at DuPont's research facility at the DuPont Experimental Station...

 with a mesh lining
Lining (sewing)
In sewing and tailoring, a lining is an inner layer of fabric, fur, or other material inserted into clothing, hats, luggage, curtains, handbags and similar items....

 for quick drying.

Trunks as men's underpants
Underpants
-Boxer shorts:Boxer shorts, or simply boxers, have an elasticated waistband that is at or near the wearer's waist, while the leg sections are fairly loose and extend to the mid-thigh. There is usually a fly, either with or without buttons...

 are a shorter version of boxer briefs and made in modern and traditional styles. Like boxer shorts, trunks cover the mid-section of the body (hence the name "trunk"). The modern styles are usually form-fitting like briefs
Briefs
Briefs are a type of short, tight underwear and swimwear, as opposed to styles where the material extends down the legs.In the case of men's underwear, briefs, unlike boxer shorts, hold the wearer's genitals in a relatively fixed position, which make briefs a popular underwear choice for men who...

, but some styles, such as the original traditional ones which date back to the 1930's are loose fitting like boxer shorts
Boxer shorts
Boxer shorts are a type of undergarment worn by men. The term has been used in English since 1944 for all-around-elastic shorts, so named after the shorts worn by boxers, for whom unhindered leg movement is very important.Reasons for a preference for boxers can be attributed to their variety of...

.These are invariably made in white only from material used for vests and have considerably declined in popularity. Trunk briefs extend over the legs like boxer shorts. Trunk briefs have a shorter inseam than regular boxer briefs, covering only the upper thighs and resting below the true waist.
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