Universal Textiles Childrens Boys Dinosaur/Pirate Cotton Underwear Briefs (Pack of 5) Cotton, , Boys underwear briefs (pack of 5). Choice of pirate and stripes or dinosaurs design. Elasticated waist on each. Choice of 3 sizes (Age/Waist)- 3-4 Years: 20.5in - 21in, 5-6 Years: 22in-22.5in, 7-8 Years: 23in - 23.5in, 13 Years: 62.25in approx. 100% Cotton.