What's so great about these?

I bought some and got them yesterday and first off they are shiny so they seem like work out pants and second they weren't any better/worse than all my other leggings.

So if you own them why do you LOVE them? I feel like I bought into the hype =(

ETA: just looked them up and realized they ARE work out pants - haha - guess I didn't know that when I bought them