To use this swimsuit, simply put it on like you would any other swimsuit. It's great for swimming at the beach or pool, or just lounging around. When it comes to care, rinse it with fresh water after each use to remove salt, sand, and chlorine. Don't wring it out; instead, gently squeeze the excess water. Hang it to dry in a shaded area to prevent color fading. Avoid using harsh detergents or bleach as they can damage the fabric. Also, store it in a cool, dry place away from direct sunlight. If you're not sure about the size, you can refer to the model's size and fit information provided in the product description.