These are hands down the best leggings out there. I own multiple pairs of these and they can be worn anywhere. I wear them to the gym and even out with boots and a long sweater/shirt. I am 5'8" 150lbs and I purchased a medium. They hold up well in the wash and have a nice matte look, not shiny.
These leggings are very thick and feel durable. Looking forward to wearing them in the fall/winter. They are VERY tight though, I am 5'2" 110lbs and opted for the Small as the XS were tough to get on/off being so tight.