This swimsuit is made of 80% polyester + 20% spandex. The fabric of our one-piece swimsuit for baby girls is durable, soft, flexible and has great elasticity and durability. With UPF 50+ rated fabric, this girl's long-sleeved swimsuit offers a playful, worry-free holiday without worrying about sunburn. This baby girl one-piece swimsuit will give your girl the freedom to explore and shine in the crowd.