I've never had the lulu leggings that everyone says these are a dupe for, but I don't think I will ever need to get the lulu leggings, these are so soft and plush with a great amount of stretch, without becoming sheer at all. Super squat proof, and they stayed up throughout a 10km run which I have never had leggings do before. I am between a S and M, and went with S based on reviews, and it was the right choice. The stretch means they fit easily and the slightly smaller sizing might be why they stay up so well. Definitely going to get other colours of these!