I searched for any ramp that mentioned it would be good for outdoor use.  I could never find one that actually said so.  But this one looked sturdy and durable and like it would hold up in the direct sun.  I needed a permanent one for my senior dog to get down the back stairs. So far so good and I'm very happy.  My boy still will not use it on his own, but if I point he will go up and down the ramp.  The funny thing is, now he is running down next to the ramp, using it as a guide and isn't falling like he was.  So it has a dual usage!  I recommend this great product.