The tag was taken out of these. I believe they are size XS! lightweight, swift fabric Lightweight Four-way stretch Sweat-wicking Quick-drying features Built-in liner with grip at the hem Mesh fabric panels for ventilation A discreet zippered pocket in the seam for small items Stash your stuff in the side drop-in pockets on the short liner Continuous drawcord is easy to cinch and won't get lost in the wash Reflective details