a set of shoes or lasts covering a range of shoe sizes and perhaps also shoe widths
For example, a full run of men’s sneakers might be 16 total pairs, from US men’s 7½ to US men’s 14 in half sizes, all in size D. A full run of lasts for a unisex shoe might be 64 total lasts, for the same run of shoe sizes in AA, B, D, and EE widths.