Boxer shorts (also known as loose boxers or as simply boxers) are a type of undergarment typically worn by both men and women.Boxer shorts are available in white and solid colors including pastels, and come in a variety of patterns and prints as well; Traditional patterns include "geometrics" (small repeating geometric designs), plaids and vertical stripes. Additionally, there are innumerable "novelty" boxer short patterns. Boxer shorts are produced using various fabrics including all cotton, cotton/polyester blends and jersey knits.
Some studies have suggested that tight underwear and high temperature are not optimally conductive for sperm production. The testicles are outside the body for cooling because they operate for sperm production at a slightly lower temperature than the rest of the body, and boxer shorts allow the testicles to operate within the required temperature range. The compression of the genitals in briefs may cause the temperature to rise and sperm production to fall. There is a similar theory regarding testicular cancer risk.Other sources dispute this theory. A study in the October 1998 Journal of Urology, for example, concluded that underwear type is unlikely to have a significant effect on male fertility.