Elastic webbing is actually a very old method of support that goes back a hundred years or more. It has been used on very expensive sofas as well as inexpensive models. The advantage of elastic webbing is that it has a very narrow profile (unlike coil springs which require a substantial amount of space beneath the seat.) If properly installed, elastic webbing should not sag in the middle, particularly in so short a time period. You should contact the store where you bought the sofa and ask them to remedy the situation.

Thank you for the information!

I am not sure if I am being nitpicky or not. You wouldn't notice it if you just sat in the middle but if you move from an outside seat to the center it is quite noticeably lower.

To cut costs some manufacturers, especially in Asia will use a lower quality elastic webbing. If the sofa is leather the elastic webbing usually is about the 4th most expensive part of making a sofa, just ahead of the labor costs. It requires a strong frame to support the elastic webbing when installed correctly and using a quality elastic webbing. If the manufacturer doesnt follow this then the results will be as you are experiencing now.

Are you folks referring to Pirelli webbing? I recently heard of it (saw it under a Natuzzi loveseat). Salesman didn't describe it as being elastic; rather said it was seatbelt-like material, and that's what it looked like. When I looked skeptical, salesman indicated it made for a wonderfully comfortable sofa that lasted a long time.
The Natuzzi sofas all had the webbing. I understood the salesman to say that the webbing _replaced_ the springs. Again, I was skeptical.
The Natuzzis were very comfortable in the store; however, I've been used to sitting on an extremely uncomfortable 20 yr old hide-a-bed sofa, so just about _anything_ seems more comfortable than that!I'm desperate for a new sofa, but afraid of making a bit mistake. So, what about the webbing?

We had a natuzzi sectional for over 30 years

now its being handed down to my 24 yesr old grandson

no tears a lttle softet petfect comfort

We love our Natuzzi so much! It is over 25 years old (it was my Dad's) and the sofa bed part broke (it was abused, not a manufacturing issue). I saved the straps and the couch, but we removed the sofa bed frame. The straps are high quality. I'm hoping to figure out how to make a new support using the straps. The leather on this couch still look new. It is so comfortable and attractive that people still asking me where we got it. Well, not now... It is in my garage waiting to be repaired. It is in better shape than my 10 year old sofa from Macy's.