The product title is the single highest-leverage field in Google Shopping. We rewrote one motorcycle-trouser title into search language; with nothing else changed, daily impressions went from 42 to 804.

Best-seller "Falcon Antrasit Erkek" showed 42 times a day in free listings while "motosiklet pantolonu" gets ~4,400 searches a month. New title via supplemental feed: product type + brand + model + colour + gender + size. Impressions 42 → 273 → 804 in three days.
Traps: the supplemental feed must be linked to the primary source by rule or it is silently ignored; feed label mismatch makes a campaign look active while showing nothing; wrong category ("Jeans") wastes the right title.
First free-listing sale 21 Aug (₺6,390); month end: 3 orders from free listings, 27 from organic search. Five checks for your own feed.