Men's Boxer Briefs, Stretchy, Quick-Drying, Breathable Size XS, Set of 4 The package says L, but the size is small, and I think it's best for a waist around 70cm (stretches with the elastic). The feel and breathability are good, and they don't get stuffy, so how about them for junior sports underwear? Brand new, unused. 94% Polyester, 6% Spandex Colors: Red, Brown, Blue, Gray (2 pieces) Size...XS (SS) Color...Gray