You can cut to desired width and shape with sharp scissors, roll cutter or with a sharp knife.
Can be used to watertight seams or to attach patches, zippers, reflective tape etc. to projects.
For waterproof gear it eliminates the need for seam taping.
See the Sewfree patch howto.
Application temp: around 120 °C, needs to be tested for each material.
Note that this adhesive film doesn't attach to all materials like silicone coated fabrics, porous materials like thick fleece and so on.