I've had these Teeki moon pants for so long and I can't believe I haven't done a review on them yet, especially considering how often I wear them. Teeki uses recycled plastic bottles in the material so they're eco-friendly. But if plastic bottles in your fabric makes you squirm, don't worry. The fabric is smooth, light, and breathable.
The sizing is true to size, I'd say. I have an XS and they fit similar to a Lululemon size 4.
I really like the reinforced stitching. It allows for peace of mind that your pants aren't gonna split in downward dog, and the stitching is really stretchy, so it allows the pants to move with you. The crotch is gusseted, so they're super comfortable.
The other plus to point out is the wide, flat waistband. The wide band ensures the pants stay in place, though if you prefer a low cut pant you can just roll the waistband down.
At just under $70, they're less expensive than Lululemon pants and are close in quality. I would say the Lululemon fabric offers more security because the fabric is thicker, but I really love these pants (and have three other pairs by the same brand). Have you tried them? Would you?