Going up a Size is the smartest thing with these Trust Me
They run very very small
I'd recommend getting a size larger than you'd normally get. They have a small fit but otherwise are comfortable and lightweight.
I order a medium, got a large sent instead; however I think the large would be better for me
I bought these joggers for my 15 yr old son for Track practice. They're stylish and comfortable, he son loves them! My son is a slim 5'9", with a 29" waist, the size medium fit him great!