prima de operetta Summer One-Piece Size 01 Material: 95% Polyester, 5% Polyurethane My wife wore this a few times, but she doesn't have the opportunity to wear it anymore, so she's selling it. The main material is polyester, so it feels smooth against the skin, and the polyurethane provides stretch. There is a slight stain on the ribbon. It's not noticeable when tied, but please refrain from purchasing if you are concerned.