Online shoppers can't try items on, so they guess their size — and wrong guesses become returns. SizeGuide adds a "Find my size" button to your product pages. Shoppers answer a few questions and get a clear size recommendation from your own measurement charts, or an AI mode that adapts to fit preferences. Create unlimited charts, assign them by tag, collection, or product, and import sizes from CSV. A built-in dashboard shows which sizes are recommended most.