I'm a grad student with kids, so my budget is limited but I lead a very active lifestyle. I have a few pairs of random $5 - $7 cheap running leggings from Amazon, collected over the years. Some are better than others, but in general, they fall down or annoy me in one way or another. Had my first Tough Mudder obstacle course race coming up and wanted truly reliable running pants.

These pants win on every level. They're the right height, never slip. Held up to a couple months of cross training, indoors as well as outdoors, and through the entire Mudder with all of its various obstacles. I didn't think about them once during the race, and to me, that is how you know you are wearing some good pants.

Highly recommend. I got them on a lightning deal for $16, but would pay more. They're worth it.

For sizing reference, I am 6'0" and 145 pounds and ordered a size small.