Regrouped size and price buy box: +$386,441/month revenue
Test run byConvertiblesCRO agency
Commentary byLiftArchiveOur analysis, not theirsRearranging the product page buy box, with price next to the star rating, fit guidance beside the size guide and a new 'SELECT SIZE' button, added a reported $386,441 a month in revenue.
Convertibles ran this test for an 8-figure luxury pajama brand.
No new content was added; the winner reused the same elements in a different order.
- Revenue: +$386,441 a month for the regrouped buy box, as reported by the agency.
- The same layout with the carts line rewritten as '102 People Have This in Their Cart' did not beat it.
- A bigger rebuild, with price moved down beside the size picker and a gift-with-purchase offer in the first screen, lost.
- Sample size, test length and confidence were not shared.
The change
Same elements regrouped: price with reviews, fit help with size, plus a Select Size button.
Simplified mockup drawn by LiftArchive from the shared screenshots.
Control
Each buy box element sat on its own line: star rating, then price, a right-aligned size guide link, a plain size dropdown and an 'In 102 Carts' line at the bottom.
Variant
Price moved onto the same line as the rating and review count, 'Size and Fit Information' sat beside the size guide, the carts line moved up, and a 'SELECT SIZE' button was added below the dropdown.
Why it likely won
Our reading of the result, not the practitioner's claim.
- Price and proof on one line let a shopper weigh a $298 item against its reviews at a glance.
- Fit help placed right above the size picker meets the worry about returns where it happens.
- A button that names the next step is clearer than a dropdown waiting to be noticed.
- The bigger rebuild added a promotion, which may have pulled attention away from the decision.
Caveats: The agency reported the lift as monthly revenue and did not share sample size, duration or confidence. Layout and the new button changed together, so the test can't say which did more.
Who ran it
Convertibles ran this test for an 8-figure luxury pajama brand and published the results (Convertibles case study). The numbers are theirs; the summary and commentary on this page are ours.
Read the original case study on Convertibles →
How to run this test on your store
- Hypothesis
- If we group price with reviews and fit guidance with the size picker, and add a clear 'Select size' step, then more shoppers will add to cart because the two questions that block a purchase are answered in one place.
- Primary metric
- Revenue per visitor
- Guardrails
- Add-to-cart rate
- Return rate for wrong size
- Average order value
- Who should test it
- Apparel and other sized products at a mid-to-high price, where fit doubt slows buyers down. It matters less for one-size items or pages that already pair price with proof.
Questions
Should price sit next to the star rating on a product page?
In this test, putting them on one line was part of the winning layout.
It lets shoppers judge cost and proof together without scanning the page.
Does a 'Select size' button add friction?
It adds a click, but it also makes the next step obvious.
Here the version with the button won, though it changed together with the layout.
Do I need new features to improve a buy box?
Not always. This winner used only elements the page already had, moved closer to the decisions they support.
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