How to add size descriptions to shoe variants on Shopify?

Retail & Point of Sale

Topic summary

A retailer selling brand-name shoes across multiple platforms (Shopify, Amazon, eBay, Walmart) needs to display size conversions differently depending on the channel.

Core Issue:

  • Internally uses a single “core size” (e.g., size 5) in their POS to avoid cluttering reports
  • Externally needs to display full size descriptions with conversions (e.g., “5 US Men / 7 US Women” for Converse, “5 Men / 6.5 Women” for Vans)
  • Conversion ratios vary by brand and region (US, UK, European sizes)

Technical Challenges:

  • Wants to auto-generate size descriptions based on brand/collection conditions rather than manual entry
  • Current theme (Dawn) only allows adding product metafields, not variant metafields
  • Considering switching from current inventory management system to Shopify as primary source
  • Amazon requires different size specification format when creating listings

Seeking Solutions:

  • App recommendations that can handle automated size description generation
  • Methods to implement this using metafields at the variant level
  • Ways to push appropriate size formats to each sales channel
Summarized with AI on November 14. AI used: claude-sonnet-4-5-20250929.
1

HI

we selling brand name shoes on shopify, amazon, eBay, Walmart

on many of our brands, we using something that called “size description”,

for example if we have a unisex sneaker a by Convers, the actually size would be 5 , the size description would be 5 US Men / 7 US Women, and for example VANS unisex sneaker size 5 would be 5 Men / 6.5 Women, and it would be the same with European and UK sizes , we enter all sizes tot eh system with the core size which would be 5 , however when we push it to shopify website , eBay , Walmart, we want to send it like this , 5 US Men / 7 US Women,

i do not want to enter the long description inside my POS , since it will clutter the reports , so internally i want to use the core size , however i want to push out the size description

amazon works differently , so when we create the listing , we need to send it per amazon size specification

our current system create this in then back end, however we are looking to stop working with our current inventory management , and use shopify as our main inventory source

i need to know if there is an app that can do this for us ? or if its possible to do this with metafiled, i know i can do it in the Metafiled variant filed , however in my theme (dawn) its only allowing me to add Product Metafiled and not variant metafiled ,

i need to know if there is an option to authomatcily generate these values based on condition same as we do it in collections , and not manually