Sizing Guidelines

Use complaint size values, use attributes such as size name, and size type.
Size type is listed in alpha, for e.g. S, M, L, XL or in numeric, for e.g. Size 30, 32, 34 etc.
Size type can also be in age range, for e.g. ages 3-6 years, 6-9 years or in band size (elastic), for e.g. 32, 34, 36.
You need to provide brand-specific size charts for all the products.
You can use A+ content for branded AISNs.

For more information, refer to the Amazon seller guide’s apparel sizing standards

Age range is required, for e.g. baby, kids, adult.
The footwear size system is required to display marketplace-specific shoe sizes, for e.g. UK size 8, US size 8.5, Euro size 41-42.
Shoe size gender (conditional) might be required as for some brands men’s and women’s sizes might be unequal.
Shoe width is required to be displayed, for e.g. medium, wide, and x-narrow.
Shoe size to range (if applicable) is required for e.g. if a shoe is listed UK size 8/9 then you would select shoe size value as 8 and size to range value as 9.
For unisex products (conditionally mandatory), opposite gender values must be provided for e.g. 7 UK Men/6 UK Women.

For more information, refer to the Amazon seller guide’s shoe size standards.