On the Athelta's website there is a fit tip that says to size down for these. There isn't anything smaller than a petite XS but thankfully these still fit. I would say they do run slightly larger than normal and since they run large, there is no compression in these tights. They feel like Lululemon's Aligns. That said, they're super comfortable!
These leggings are made of Powervita fabric which feels buttery soft. The inside of the tights feel soft.
WAIST is 13" Flat across the front
RISE is 10"
HIPS are 15"
INSEAM is 26"