the.com/matting
The frame's quiet wingman, giving art the breathing room genius demands.
means The bordered cardboard layer between a picture and its frame, separating image from glass while drawing the eye inward.
from From the French mat, meaning dull or lusterless surface, by way of matte paint finishes; the framing sense arose as flat board distinguished from glossy glaze.
Air gapKeeps art off glass, preventing moisture damage.
Acid-freeCheap mats yellow and burn artwork over decades.
Negative spaceWider borders read as more expensive, no upgrade needed.