Best long sleeve rash guards for toddlers: Uzzi Amphibious Gear specializes in sun protective shirts. We manufacture the best lightweight rash guards for toddlers with UPF50. Our toddler’s rash guards are made of polyester and spandex providing ultimate comfort and stretch. If you are looking for sun protective shirt for toddlers to swim in, Uzzi has you covered! Check out our long sleeve rash guards with UPF50. This long sleeve rash guard #4700TL light blue will be the best choice for you.