What counts as a Spandex Brief (a.k.a. “Speedo”)? A spandex brief is a fitted swim bottom with a mid-to-high leg line, front lining, and a waistband that typically sits on the hips. Fabric is usually a blend of nylon (or polyester) with elastane (spandex/Lycra) for stretch. Compared to jammer shorts or boardshorts, briefs minimize material …