I could barley hear them over their swishing polyester track suits, but they said our last name is almost as Italian as Marco. ; )  All kidding aside thanks for the welcome message.  

When you are buying carpet, polyester is cheaper, but also shows foot wear much faster than nylon.

High cotton content shirt - 100% will wrinkle like hell, but majority polyester or similar holds odors and looks cheap.

PET (polyester) carpets have come a long way, and are excellent for stains, but will show traffic patterns faster than nylon 100% of the time.

Tenants love hard surface floors.For stairs use a berber style polyester carpet, it is very tough and inexpensive and good in catching dirt before you get to the unit.Correct install is critical.

Hotels use percale sheets (cotton polyester blend) and so do we - they last, and they're comfortable.

I did some reading online, and came up with the below parameters on which the choice of carpet can be based:Carpet material: Nylon/Polyester(PET)/Triexta, etcCarpet cut: Cut-pile/Plush/Berber/Loop, etcCarpet Face weight: 14oz/17oz/25oz, etcCarpet pad: 8lbs, etc..I spoke to a few carpet stores in town, but each one of them told me a different choice.

You might be able to resurrect it if it's nylon, but if it's polyester, it won't improve much.

And that first coat of oil-based poly isn't going to be mopped around with an applicator, oh no, you're gonna be on your hands and knees with a white China bristle natural brush with no polyester blended in there.

I plan on a cheaper polyester with an upgraded padding in a neutral color.