Quick Answer: Panties are form-fitting underpants worn by women. Typical components include an elastic waistband, a crotch panel to cover the genitalia, and a pair of leg openings that, like the waistband, are often made of elastomer. Various materials are used, but are usually chosen to be breathable. Panties are made of a variety of materials, including cotton, lace, latex, leather, lycra, mesh, nylon, PVC, polyester, rawhide, satin, and silk. Construction typically consists of two pieces that are joined by seams at the crotch and sides; an additional gusset is often in the crotch, with the waistband and leg-openings made from elastomer.