Tori Hall's Avery Leggings by Helen's Closet
Now that I have had these for a couple of months I can really say how I feel about them! (Which is pretty much the same. Haha!) I LOVE them! I wear the black and white pair the most, the maroon version usually follows (because they aren't as tight and tend to fall down a bit), and the multi-colored if I'm feeling like I want to squeeze into them, but they DON'T BUDGE when I run.
You can read more about my alterations in my blog post, but as long as the top of the elastic hits the top of your hips, they can't possibly slip down. I love them and I still plan on making one or two more for around the house.