Ali Demirbaş - Lab

Product Detail Page

Model Height and Size Info on Product Pages A/B Test

A model’s height and the size they wear can give shoppers a reference when choosing a size.

  • Product page
  • Purchase conversion rate (CR)

Control vs Variant

Absent on one side, present on the other.

Changed
Presence
Page
Product page
Difference
added

Hypothesis

This may reduce uncertainty but cannot guarantee fit. Compare purchases with the product images, size chart, and stock information held constant.

How to run this test

Primary metric

Purchase conversion rate (CR)

Compare purchases per assigned visitor with and without verified model sizing information.

Other metrics

  • Add-to-cart rateTrack progress toward purchase through add-to-cart.
  • Size chart interaction rateRead this alongside purchases and returns; fewer chart opens are not automatically better.
  • Return rateTrack returns and, where available, size-related return reasons.
  • Product review timeInterpret time alongside outcomes; longer review can be useful.

What to check before and during the test

  • InformationAdd the model's verified height and the size actually worn.
  • Other contentKeep images, stock, size chart and product copy unchanged.
  • Detail setThis test includes height and size; testing size alone is a separate comparison.
  • PlacementChoose one readable placement and keep it fixed.
  • CategoryReview apparel types where sizing needs differ.

Setup mistakes to avoid

  1. 1Do not publish inaccurate or inconsistent sizing information.
  2. 2Use plain language rather than technical terms.
  3. 3Keep text legible and within the image boundaries.
  4. 4Do not change the size chart or stock information during the test.
  5. 5Do not generalize a result from one product to the full catalog.