stylish short sleeve .low round neck top .It may be used by boys and girls.The fabric is weather friendly. It does not accommodate heat in any way. Made with superior combination of cotton and spandex. It is quite fashionable for kids.Easy to wash and maintain.Size M is suitable for 3-6 mnths, L is best for 6 to 9 mnths,XL just right for 9 to 12 mnths. while XXL is just right for 12 to 18 mnths.