A Google Shopping campaign is only as good as the product feed that powers it. Most D2C brands launch Shopping with a default Shopify feed export and wonder why their CPCs are high and their ROAS is mediocre. Feed optimisation, negative keyword management, and campaign structure account for 80 percent of Shopping performance variation between brands selling similar products. Here is the optimisation system.
Product Feed Optimisation: The Foundation
Product title: Google's Shopping algorithm matches your product to search queries primarily based on your title. Format for maximum relevance: [Brand] [Product Type] [Key Attributes] [Size/Variant]. "Nike Men's Running Shoes Blue Size 10" is searchable. "Model X2 Pro" is not. Review your current titles against this format and rewrite every title that leads with a model number, internal SKU, or vague descriptor.
Product type field: Shopify exports a basic product type but Google's taxonomy is more specific. A product typed as "Supplements" could be more specifically "Health & Beauty > Health Care > Fitness Nutrition > Protein Supplements". More specific product type categorisation improves your ad's relevance matching to specific queries. Use Google's product taxonomy reference to find the most specific applicable category for each product.
Custom labels: Shopping campaigns use custom labels (0 through 4) to segment products for different bidding strategies. Set up: custom label 0 = margin tier (high, medium, low), custom label 1 = bestseller status (yes, no), custom label 2 = seasonal relevance (evergreen, seasonal). These labels allow you to bid higher on high-margin bestsellers and lower on low-margin slow-movers within the same campaign.
Negative Keyword Management
Shopping campaigns run on broad match by default, meaning they can appear for unexpected search queries. Review your search terms report in Google Ads weekly for the first 60 days. Add negatives immediately for: competitor brand names (unless running conquest), queries with no purchase intent ("free", "DIY", "how to make"), and categories adjacent to but not exactly matching your product. Brands that run 30 days of Shopping without negative keyword review typically have 20 to 35 percent of spend going to irrelevant queries.