Size guide link moved above the size dropdown: +21% conversion
Test run byGrowthRockCRO agency
Commentary byLiftArchiveOur analysis, not theirsMoving the size guide link up to sit just above the size dropdown lifted conversion rate by 21% for an apparel ecommerce client.
GrowthRock ran this A/B test, which reached 96% significance after 10 days.
Average order value rose 22% and revenue per session 46%, but each version had fewer than 200 conversions.
- Conversion rate: +21% at 96% statistical significance after 10 days.
- Average order value: +22%.
- Revenue per session: +46%, combining the two gains above.
- Few people clicked the size guide: heatmaps showed about 1.65% of tracked desktop users and 0.31% of mobile users.
The change
The size guide link moves from the description to above the size dropdown.
Simplified mockup drawn by LiftArchive from the shared screenshots.
Control
The size guide link sat low on the product page, inside the description.
Variant
The size guide link moved up to sit just above the size dropdown.
Why it likely won
Our reading of the result, not the practitioner's claim.
- The size guide answers a key question at the moment shoppers pick a size, so it makes sense next to the dropdown.
- Its new position may reassure shoppers that help with fit exists, even if they never open it.
- If sizes often sell out, shoppers need to judge whether another size will fit, which makes sizing help more important.
Caveats: Each version had over 20,000 sessions but fewer than 200 conversions, and GrowthRock itself advised caution. The test dates from around 2020.
Who ran it
GrowthRock ran this test for an apparel ecommerce client and published the results (GrowthRock blog). The numbers are theirs; the summary and commentary on this page are ours.
Read the original case study on GrowthRock →
How to run this test on your store
- Hypothesis
- If we move the size guide link next to the size selector, then more visitors will buy because fit help is visible when they choose a size.
- Primary metric
- Conversion rate
- Guardrails
- Return rate for wrong size
- Average order value
- Add-to-cart rate
- Who should test it
- Apparel and footwear stores where fit is a common worry or sizes often sell out. If most shoppers are repeat buyers who know their size, expect a smaller effect.
Questions
Where should a size guide link go on a product page?
Next to the size selector is the natural spot.
In this test, moving it there lifted conversion rate by 21%.
Can a small link change really affect sales?
It can when the link answers a question that blocks purchases.
Few people clicked it here, yet sales still rose.
Is a test with under 200 conversions reliable?
Treat it with caution. Small samples can show large swings by chance, so a retest or longer run is wise.
Similar tests
@oliverkenyon@oliverkenyon@oliverkenyon@oliverkenyon@oliverkenyon@oliverkenyon