If you want boys to have a contemporary look without sacrificing quality and comfort, then consider Casa Das Cuecas. Translated as House of Pants, their underwear is branded under the UW name. One attractive style is the microfiber striped boxer brief in the first image that comes in a longer length to prevent friction between the legs. There are no side seams, giving boys that modern, sleek appearance. Visit their website at casadascuecas.com.br.