I've come across something that has stumped me and thought I'd see if anyone has a clue about this.

On my selling account I sell shoes.  If I create a variation based on US Sizes - say Sizes 9, 10, 11, 12, 13...which size do I put in the Item Specifics field 'US Shoe Size' ?  

In theory the listing is for all sizes.

Thanks in advance to anyone who can help!