Oopbuy Shoes
Spreadsheet.

Start with the correct size system

Record your foot length and check which size system the listing uses: EU, UK, US men's or US women's. Nike explicitly distinguishes foot length from the CM number printed on its shoe labels. Treat an official chart as a reference for the corresponding brand and model, rather than a promise that a seller's pair follows it. Ask for the listing's own size chart when the conversion is unclear.

Nike source

Match the shape to how you will wear it

Write down your intended use before comparing pairs: casual walking, work, travel or a specific sport. Request the exact model, available width, upper material and outsole details. A side photograph cannot establish cushioning, grip or suitability for running. If you wear thick socks or use an insole, include that in your fit questions. Compare toe shape and opening with a comfortable pair you already own, rather than relying only on a styled photograph.

Plan for the actual upper material

Nike's shoe-care guide starts with removing loose dirt using a soft brush and recommends air drying at room temperature. It also gives material-specific advice: leather, suede and knitted uppers should not be treated as interchangeable. Check the supplied care instructions before applying a cleaner, and test an inconspicuous area first. Keep the product description and your order variant so you can compare the delivered colour, size and material with what you selected.

Nike source