A [[swimsuit]] worn by males, mainly in [[competition swimsuit|competitive]] settings. They resemble [[bike shorts]] in that they cover the mid-waist to the area above the knee. 

h4. See also

* [[legskin]] for swimsuits that cover the entire leg
* [[male swimwear]]

h4. External links

* "Wikipedia: Jammer":https://en.wikipedia.org/wiki/Competitive_swimwear#Jammer