Baby Boy Swim Trunks with UPF 50 Protection (Navy Stripes 12 Months) Protect baby from the sun with these adorable swim trunks! Board shorts style swim trunks feature bold fish design on navy background. Elastic waist, mesh liner. Swimsuit fabric content: 100 % Polyester with UPF 50+. Protective Features: UPF 50+ Sun Protection.