A temporary backstay set up to windward as a boat comes about and the leeward one is slacked off

The adjustable backstays of the main mast (main runners) and the topmast.

Also runner, or preventive backstay. A stay that supports the mast from aft, usually from the quarter rather than the stern. When the boat is sailing downwind, the runner on the leeward side of the mainsail must be released so as not to interfere with the sail.

Also known as a runner. Adjustable stay used to control tension on the mast.

In some sail boats, there are two running backstays. Each one runs from each lateral corner of the stern to the mast at the level where the forestay begins in the fractional rig. Together with other rigging, it supports the mast.