Nike Air Max BW (40)

The Nike Air Max BW in size 40 is a sweet spot for collectors who actually want to wear their vintage kicks. As a common unisex size, it surfaces more frequently than the extremes of the size range — but don't mistake availability for low demand. Clean pairs in this size disappear fast, especially since the gabber revival brought a whole new generation of buyers to the table.

The BW — Big Window — earned its legendary status on the dance floors of 90s Rotterdam and beyond. It was the shoe you'd see under every pair of Australian trackie pants at Thunderdome, Hellraiser, and countless illegal raves. Nike probably never imagined their 1991 running shoe would become the symbol of an entire music movement, but that's exactly what happened. And that story is what makes it collectible.

Condition is everything with vintage BW's. The Air unit is the first thing to check — squeeze it and make sure it still has bounce. A deflated Air bag means the shoe has lost its soul, literally. Next, examine the midsole paint for cracking and the upper material around the toe box. If the seller claims "deadstock," ask about storage conditions — heat and humidity destroy unworn pairs just as effectively as daily wear does.