doggie said...But what is a down winder or doing down winders.
Im a shortboarder and only know on & off shore

i see in your profile you don't have any mention of sups. ok its sups paddling out in the ocean on big boards with preferably the wind behind you and the swell running with wind. the wind helps push you along so you can catch the ocean swells known as runners. 200m rides is not uncommon in good conditions, and when you can link those rides your in heaven. so when surf conditions are shot, that can be a good time to do downwinders. skis and oc's and other craft look for these conditions too, but we get to standup
cheers