* Gathered strap details * High-waisted bottom with elastic waist * Top: partially lined | Bottoms: fully-lined * 85% nylon 15% spandex * Lining 100% polyester Sizing: The best way to find correct sizing is to choose a similar item (preferably swim) that fits your child well and measure that piece laid flat. Then compare them to our measurements. Keep in mind swim fabric has stretch but also becomes looser when in the water. We designed our swim to fit snug. You can size up when in doubt, but we do not recommend sizing up several sizes above your child's current size.