An MPS spinnaker is used on a broad reach (when the wind blows from the side of the boat) or a run (when the wind comes from behind) in light winds. A pole is not required to hold it in place.

It has a tackline that holds it to the bow of the boat, and a sheet (rope) that is used to control it.

When it is time to bring the sail down, it has a sock that wraps down over it like a pillowcase.

Links

Link to You Tube showing how the MPS is raised and dropped

Hoisting and Dousing an MPS/Asymmetric Spinnaker

 

The links below are worth a read.

MPS Spinnakers   

Asymmetrical Spinnaker