Somewhere between 'it depends' and 'we don't know.' Our covers are made to last for years with regular use, but the specific lifespan will depend on the environment the chair is in. Some of the variables that go into this are: exposure to the elements, harsh vs mild climates, humidity, and generally how the chair is used/cared for. All of the materials we use are sourced from reputable vendors and should hold up well regardless of indoor or outdoor use. The performance acrylic fabric we utilize is designed for outdoor furniture and comes with a five year factory warranty.