Little and big kids will love these Marvel Spider-Man swim trunks! They have an elastic waist with an adjustable drawstring. Mesh lining on the inside of the swimwear. Spidey swinging in the city super hero graphics. The material of the swimsuit is 100% polyester. Get ready for summer and swimming- at the pool, lake, beach, ocean, etc!! Get for your favorite super hero! Sizing is little boys 4/5 and 6/7 and big boys 8, 10/12, and 14/16. Swimsuit also has UV 50 to help prevent sunburn. This is a great swim short for the new Spider-Man movie fan.