I could've made this with cheaper materials, but I chose not to.
The outer shell is 100% nylon, fully waterproof. Same for the duffle bag. Nylon costs more than polyester. It also doesn't shred when it gets wet or rub through after a few trips.
The inner lining is 230T polyester. Tightly woven so it doesn't rip when you stuff a pocket, but light enough that you're not sweating through the airport.
The zippers are high quality, not the bendy ones that snap after a month. The logo on the front is 3D puff embroidery, actually stitched in, not a print that peels off.
And the stitching. 16 accordion pockets means reinforced corners, triple-stitched seams, and gusset sides on every single one. There are more stitches in this coat than most jackets have in their entire build.
No expense was spared. The price reflects that.