This ramp is ideal for indoor or outdoor use and provides a safe and smooth ground-to-sill transition. It is especially for sliding glass doors because it does not interfere with the door track. Made with 100% recycled rubber, the TRANSITIONS Angled Entry Mat is eco-friendly and can be used safely on nearly any surface. By nature, the recycled rubber material is slip-resistant, so users can feel secure and confident when using the TRANSITIONS Angled Entry Mat. It truly is a safe "welcome mat" for any home.