I’m in between a S & M and prefer this in a M. Never worn size Small. Versatile 3 inch (7 cm) onesie in our sculptLUX active fabric, that's super soft and supportive without being restrictive, as well as smoothing and sculpting without pinching. Designed to hold you in, our sculptLUX fabric is soft, sculpting and flattering. Features lined flyaway shorts, wide straps, elastic waist with adjustable bungee, square neckline and active fabric. Model wearing size small Lower Body Lining:78% Polyester, 22% Elastane / Lower Body:86% Polyester, 14% Elastane / Pad Foam:100% Polyurethane / Pad Lining:100% Polyester / Upper Body Lining:88% Polyester, 12% Elastane / Upper Body:78% Polyester, 22% Elastane