The stairs are lightweight and can be easily folded for storage when needed.  We originally bought these for our 10 year old Golden Retriever, but the cat gets more use out of them.  He uses them multiple times a day to get on and off the bed.  It took a lot of persuading to get the dog to use them, but after some practice she climbs with ease.  She has a little difficulty climbing down but she is an older, larger dog.  Overall very satisfied with this product.