Solbari UPF 50+ Women's Sun Protection Swim Dress Swimwear & Resort Collection - UV Protection, Sun Protective Accredited with a UPF50+ rating, it blocks more than 98% of UVA and UVB rays. High-quality YKK zipper makes it a breeze to put on and take off. Discreet thumbholes to cover the back of hands and prevent sun spots. Chlorine and saltwater resistant / 53% polyester, 47% PBT. Machine washable (warm cycle, 40 degrees) but we recommend hand washing as it keeps the fabric and the shape of the dress looking newer for longer. Squeeze off excess water, hang to dry.