Phifer Tuff Screen No-See-Um Screen is a tight durable mesh vinyl on polyester screen to STOP tiny insects. Tuff Screen No-See-um provides air ventilation, superior insect protection and good outward visibility. Phifer Tuff Screen No-See-Um is ideal in window screens, sliding screen doors, screened patios and pool enclosures. Tuff Screen No-See-um can be used in applications where a round or flat spline is required. Tuff Screen No-See-Um is made in the USA.