Complete Guide for Buying Men's Boxer Briefs Men's Boxer Briefs are a type of underwear that combine the coverage and support of traditional briefs with the loose fit and leg coverage of boxers. They have a snug fit around the waist and legs, with a longer inseam to provide additional coverage. They are often made from a stretchy, breathable material such as cotton or a blend of synthetic fibers, and can come in a variety of styles and patterns. Boxer briefs are popular among men for their combination of comfort and support, making them suitable for everyday wear as well as athletic activities.