Having someone’s fingerprints all over it is the colloquial metaphor for something that is easily traced back to the person responsible for that thing, either that, or the altogether more serious scenario of forensic investigation.
You would expect the metaphorical version of the phrase to be pretty commonplace in the sneaker world, where there is any number of designers with distinct, signature styles.
On this Adidas Superstar, the expression is taken rather literally. The upper sports a unique fingerprint design, pun fully intended, in black against a grey background.
If a size is not listed, it is sold out.