adidasBoys' Iconic Tricot Jogger Training Pants

Is there a draw string in the waist. My 12 yr old is skinny but has long legs & is 5'5 the XL may fit for length but might be too big in the waist

Whould the 18-20 fit a adult small?

Are these more like sweatpants or track pants material?

If you are a large shoude you get a medium.