Baby Buns Boys' Rashguard and Swimtrunk Neon Shark Attack Rashguard: 92% Polyester/8% Spandex; Swimtrunks: 100% Polyester Machine Wash Rashguard: 92 percentage polyester, 8 percentage spandex. Swimtrunks : 100 percentage polyester Rashguard and swimtrunk neon shark attack