A light weight performance material for boardsails and telltale windows. This see-through polyester film does not have any threads running through it; so, tear strength is not good but it does have great stretch resistance.
Installation is made easier if Seamstik (double-sided tape) is used to adhere the window material to the fabric before sewing and cutting. After the material is sewn in place, use scissors to trim away the fabric and expose the window.
Many windsurfer sails are made from Monofilm.