Tuga Boys Reusable Swim Diapers, UPF 50+ Sun Protection Swimwear Outer: 80% Nylon/20% Spandex. Liner: Waterproof Polyester Imported Washable and re-usable swimsuit diapers in cool prints for babies, infant and toddler boys. SIZING: Please see size chart to left, last image in product photo sequence. EXCELLENT SUN PROTECTION: Swimwear fabrics are rated UPF 50+ and provide maximum UV sun protection by blocking 98% of UVA + UVB sun rays, wet or dry; similar rating as SPF for sunscreens. Covered areas don't need sunscreen. SAFE: Tuga bathing suits are made from fabrics that are free of sunscreen chemicals, great for sensitive skin. We make skin safe and reef safe products! PRODUCT FEATURES: Elastic waist and legs assure a comfortable swim, 2 layers for the most protection, approved for public pool use QUALITY + COMFORT: Durable, 4-way stretch, and quick drying fabrics for ultimate comfort at the beach, pool, and pretty much anywhere for your little one