Lingerie stores specialize in fashionable and typically alluring undergarments. Lingerie may also refer to undergarments including flexible, stretchy, sheer, or decorative materials like Lycra, nylon (nylon tricot), polyester, satin, lace, silk and sheer fabric. However, certain cotton or synthetic undergarments can also be considered to be lingerie. The term in the French language applies to all undergarments for either gender. In English it is applied specifically to those undergarments designed to be visually appealing or erotic.