Shoes: sneakers, boots, original brands

Match the article number on the tongue tag with the official site — model and colorway must agree. Check glue quality, seam symmetry and a box with the same article. Half the market price for no reason is the biggest fake flag.

Ask for the insole length in centimeters and compare with yours. It beats EU/US sizes: the same length can differ by a full size between Nike and New Balance.

Sole wear at the edges and heel — it can't be hidden. The heel counter should hold its shape, the insole shouldn't have deep footprints. Light sole wear on leather shoes is fine: heel taps cost pennies.

Yes, with basic treatment: replace the insoles (they cost pennies) and treat the inside with an antiseptic spray. A large share of listings are shoes worn a few times. The exception is footwear visibly molded to someone else's foot — skip it regardless of hygiene.

The seam between sole and upper (leaks start there), the fur condition at the heel, membrane integrity on hiking models. Salt from past winters leaves white stains — removable, but a sign of heavy use.

Measure your foot in millimeters in the evening (feet are bigger) and compare with the listed insole length, not the EU/US size. Allow 5–10 mm for sneakers, 0–5 mm for dress shoes. The same '43' in Nike, New Balance and classic shoes is three different lengths.