About this block

Between Sizes Decider gives one rule per product as ruled rows, each backed by the exchange ledger rather than the design team: belts go up, Acme punches the extra hole free; gloves go down for bare hands, up for liners; the bag strap adjusts 40 cm and no exchange has ever been filed since the range was lengthened. The lede names the source of authority: ten years of exchanges, the ledger decided these.

Rules are one array with product, rule, and evidence per row. The evidence line is the credibility mechanism; a rule without a count is an opinion.

When to use

Reach for this block above the size chart on any product page where the item frequently exchanges for size reasons. A product earns a row here once its exchanges show a clear pattern; the footer paragraph states this explicitly.

A natural flow around it on an Ecommerce Pro page:

Before

• Product overview

After

• Size and fit guide
• Returns policy

What you can display

One strong use is the full between sizes ledger. Other decider variants:

• Footwear edition. Width and last shape rules backed by the shoe exchange data.
• Outerwear layering. The go up for layers rule with the evidence from winter season exchanges.
• Single product. One row only, inline on a product page rather than a standalone block.

Tip: zero strap exchanges since 2019 is more persuasive than any copy about the adjustment range; the absence of exchanges is the review the product cannot give itself.