I bought the serenity capri and tights and love them for yoga. The waistband is very comfortable in each style and I never have to re-adjust during class. The material is soft and comfortable and moves well. The butterfly blue color is beautiful, goes with everything and makes a nice change from black. Both this color and the teal look great matched with similar colors from the Patagonia yoga top line. I'm 128lb, 5ft6 and the small fits great. Snug at first but stretches out. Gives nice shape to the butt and the loser leg is very forgiving. Adapts nicely to casual wear outside the yoga studio! Try them, you won't be disappointed!