RUGGED BUTTS by Ruffle Butts~NEW~Rash Guard and Swim Trunks Set~Boy's Size 6~NWT. Boy's RUGGED BUTTS rash guard shirt and swim trunks set. Color: black shirt with black & white striped swim trunks. Fabric content: Shirt is 80% nylon/20% spandex; Shorts are 100% polyester.