As far as the Scent thing goes, I think it's a push but I lean towards tucking them in if nothing else to help keep out ticks. If you have your pants out the tops of your boots are not as tight. Just the movement of your toes or feet while walking pushes stink up from your boots like a big old bellows. With your pants tucked in and boots reasonably tight I think the air flow from your boots is probably LESS. I tuck 'em in.