Certain sizes, widths and hardware options are not available in conjunction with other sizes, widths and hardware options.
For example, our solid-nickel or brass hardware is not available in XS.
We currently have a limited supply of hybrid buckles available in XS suited for toy breeds less than 7lbs (also available as breakaway for cats).
Certain hardware styles and colours are only available in certain widths as available from our trusted hardware suppliers.