Print shops use a lot of words that sound like quality without saying anything. Here is what mine are printed on, term by term, and what I am not going to tell you.
180 gsm
Grams per square meter. It is a weight, and weight is a rough proxy for thickness and stiffness. Ordinary copier paper is around 80 gsm. A greetings card is around 300. At 180 the paper has real substance in the hand and will not curl or ripple the way thin poster stock does, but it is still paper and it will bend if you bend it.
Matte
No gloss. Light scatters off the surface instead of bouncing back at you, so there is no glare and no reflection of the window behind you. The tradeoff is that matte holds slightly less contrast in the deepest blacks than a gloss finish. For the work I make, that is the right trade.
Museum-grade archival paper
This is the phrase my print partner publishes for this paper. Archival, in the paper trade, generally means the stock is made to resist yellowing and breaking down over time.
I am not going to put a number of years on it. Nobody has given me a tested figure for this specific paper, and a shop that quotes you one without a source is guessing.
Pigmented archival inks
Pigment inks use solid particles of color rather than dissolved dye. Pigment generally holds up better against light and time than dye does. Again, published spec from the printer, and again, no lifespan claim from me.
Giclee
A French word that the fine art print trade adopted for high resolution inkjet printing. It sounds like a technique. It mostly means a good inkjet printer. I use the word because it is the term on the spec sheet, not because it means more than that.
Printed in the US
The printing happens at a facility in Georgia. That is a statement about where the printing is done. It is not a claim that the paper, the ink, or the packaging are all US made, because I have not verified that and the phrase Made in USA has a specific legal standard I am not going to stretch.
What you should actually do
Read the spec, then look at a print. Paper is a physical thing and specifications only get you so far. Every print is made to order, so if one arrives damaged or misprinted, send me a photo within 21 days and I will replace it or refund you.