I bought 3 pair and use them when running on the treadmill. I agree that going one size smaller creates a beneficial snug fit. One of the pair shows some friction wear and tear after a couple months, with the elastic high on the inner thigh on both sides peeking through just a little. Probably due to warm dryer settings? The other two seem fine. I would buy this product again. My wife thinks they look hot on me. I bought the Black with Red accent model.