I've been using these for yoga and weight-lifting workouts. I sweat like a beast, and the main thing I'm concerned about with a headband is that it keeps the sweat out of my eyes. These do that as well as keeping it from dripping down my face! I've never had a problem with these lightweight headbands becoming saturated and not doing their job. It both absorbs and facilitates evaporation - which is the reason we sweat in the first place (evaporation to pull heat from our bodies). These are excellent headbands for working out! Highly recommended.