I zealously (seems to be the only way I do anything) hopped aboard the synthetic activewear bandwagon because they were ubiquitous (still are). I was leggins to the grocery store, leggins for travel, leggins with tunics on casual Fridays, leggins to the gym of course. It was leggins for mah life! And eight pairs of leggings and three years later, I have come to the conclusion that even though leggings are nice, I prefer my clothes non-synthetic. Nothing is more breathable than cotton. Yes sweat, but I change out of my sweaty exercise clothes regardless of fabric. And skin being the largest organ in our body, constantly breathing, taking things in, I am not sure if covering it with plastics is the best way to go. Note: I have done zero science research fueling this concern. It’s just how I feel. Still, I’ll wear what I have, still take them to the gym, still handy for light-packing travel as they can wash and dry overnight anywhere. Going forward though, they’ll be replaced by cotton. But aside from the gym and on travel, I won’t live in them anymore. I don’t treat them as loungewear or weekend errand-run clothes. That’s where old school cotton sweatpants come in, or jeans if you want to be fancy!