I wear these over PI Pro shorts on cool days (40s-50s). They are very comfortable and move well. There is no draw string because they are very form fitting and not something you just slip into. I'm 5'7" 145lbs wearing a medium.
With the fall chill in the air, these are great for a little protection without becoming too warm during those fall days where the temperature dips in the moring and rises during the day. These tights have lots of stretch to comfortable support my large legs.