Why is it so?

Something was entirely eating at myself and others the other day when I was thinking about it… And that is why is Heating, Ventilation and A/C tubing so cheap looking? If you have ever looked at the giant tune that runs into your condo from the central heating plus a/c method unit, you will see that a lot of times the tubing looks like a plush toy for a child! Something that could legitimately be ripped at just the slightest gust of wind or bump from a rock, but somehow, it doesn’t happen like that. Also, some tubing for central heating plus air conditioners seem to be made of sheer plastic. Again, truly cheap looking! But somehow they hold up through the most drastic weather most of the time, then i turned to the internet to research a bit about Heating, Ventilation and A/C tubing plus why they look so cheap however apparently only look that way. I could not entirely find any information on the subject. It was rather uncommon that I happened to be the only person who was wondering about the look plus feel of Heating, Ventilation and A/C tubing, maybe it was my OCD kicking in? Who knows! But every single clickable live connect I clicked, every single website I looked at plus every single blog post I read on Heating, Ventilation and A/C tubing did not mention anything about what I was seeing plus thinking! It was entirely making myself and others feel like maybe I had lost my mind! So if you have the same thoughts I do plus may have more information about what Heating, Ventilation and A/C tubing is entirely made of, please let myself and others know!