90% Polyester 10% Spandex Drawstring closure FABRIC: Long lasting polyester spandex blend for durability, reduced water absorption and speed. Chlorine resistant. SPORTY DESIGN: These swimsuits are sleek, stylish and form fitting. V panel crotch for increased comfort and a sportier look. TECHNOLOGY: Flatlock stitching and a flat drawstring lie flatter and closer to the body to help speed water flow over the swimmer. Ideal for competition swimming, training, and fitness swimming. QUALITY: The Flow swim jammer is a quality swim suit for boys that will last. Over extended use these swim shorts will not become baggy or sag. SIZING: See size chart image on the left for correct sizing. Youth sizes available for little kids to young men with in between sizes for an even better fit.